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This article is about a/an rider in Kamen Rider Build.

"Now, shall we begin the experiment?"
―Build's catchphrase before transforming[src]

"Build Up!"
―Build's call whenever he changes forms[src]

"The rules of victory have been set![1]"
―Build's catchphrase after finding the winning match[src]

"This is the worst."
―Sento's catchphrase whenever things go wrong[src]

"I'm amazing! I'm the best! I'm a genius!"
―Sento praising his own work[src]

"I got a Best Match!"
―Build upon discovering a Best Match[src]

"What do you think of my invention?"
―Sento whenever he's being a show off to someone.[src]

"To protect something important...I will rise up as many times as necessary! That's the Build that we created!"
―Sento's unwavering resolve to protect the innocent.[src]

"Humans aren't that simple! Even if we make mistakes...we do research to make sure that the same thing doesn't happen again. That's the duty of science! I believe in humanity!"
―Sento's stand to protect the Earth from Evolto.[src]

Sento Kiryu (桐生 戦兎 Kiryū Sento) is a genius theoretical physicist who experiments with Fullbottles to further enhance his abilities as Kamen Rider Build (仮面ライダービルド Kamen Raidā Birudo) to fight against the evil Smash organisms. A man with no memory of his past, he was initially believed to be someone named Taro Satou (佐藤 太郎 Satō Tarō), but his true identity turned out to be someone else. As the war for Pandora Box breaks out between the three countries, Sento accepts reality for what it is in order to end the war that his previous identity had started.

History

Early Life

Main article: Takumi Katsuragi
Takumi Katsuragi (Build)

Takumi Katsuragi before his face was altered and memories wiped by Evolto.

Sento was originally Takumi Katsuragi, a research prodigy at the Touto Institute of Advanced Matter Physics, and nicknamed the "Devil's Scientist". One of the founders of Faust, he was responsible for the creation of Smash, the Transteam System, and the Rider System.

At some point, Katsuragi found that the former astronaut Soichi Isurugi and the wrestler Ryuga Banjo are an evil alien entity known as Evolto and they came to destroy the Earth as they did with Mars, before they were able to do it, Katsuragi decided to hide the Evol-Driver and lure the two men into his apartment in order to kill them. Katsuragi confronted Evolto as Blood Stalk, after confronting him, he attemped to transform into Kamen Rider Build GorillaMond, however Stalk somehow knew that it was a trap and switched the Build Driver with its prototype, causing Katsuragi's Gorilla Fullbottle to revert back into an Empty Bottle, then Stalk ordered Katsuragi to tell him the location of the Evol-Driver which Katsuragi refused. As Stalk knocked out Katsuragi, a man named Taro Satou arrived at Katsuragi's home to apply for a drug-testing job, which was part of Stalk's plan, only to see Stalk and run in fear. Before Taro reached the door, Stalk killed him and switched both men's faces and their clothes. Now with Satou's appearance, Isurugi wiped Katsuragi's mind after Ryuga was arrested in Katsuragi's apartment. Taken into Faust's lair, the amnesiac Katsuragi watched in horror as he was injected with Nebula Gas with Blood Stalk and Night Rogue, a black suited person with bat features, oversaw the process.

When Katsuragi did not become a Smash after the injection, Isurugi realized that Katsuragi would be useful in gathering the rest of the Fullbottles. Isurugi smuggled Katsuragi out of Faust, making it appear that he found the amnesiac man outside of the café Nascita, Isurugi's home and front. Katsuragi was given the name Sento Kiryu and taken into Isurugi's care, hidden in the secret basement laboratory inside Nascita.

Becoming Build

Sento is given the Build Driver

Soichi gives Sento the Build Driver.

Buildfirsttransformation13

At some point after being taken in by Soichi, he was provided the Build Driver and a set of Fullbottles that Soichi "stole" from Faust. During Sento's first fight against a Smash, he fought hand-to-hand but was beaten to the point where he had no choice but to use the Driver. Upon his first transformation, Sento defeated the Smash and headed back to Nascita, where Soichi and Misora were waiting for him. From that day on, Sento would continue being Kamen Rider Build in order to one day uncover the mysteries surrounding his past.

The Rabbit Tank Meets Dragon

After about a year of fighting as Build, Sento had gained some notoriety as the Kamen Rider. However, Sento's search was left at a standstill, as the Smash had no memories of their own experiments upon returning to human form. Meanwhile, Soichi, growing impatient with Sento's freeloading, directed him to a mid-level job at Touto Institute of Advanced Matter Physics.

Sento's first lead came in the form of Ryuga Banjo, an ex-fighter and wanted fugitive. Alerted by Ryuga's Smash energy readings, Sento followed and eventually apprehended him. Much to his shock, Ryuga had just escaped from the labs where Sento had been experimented on and had all his memories intact. The two were interrupted by Strong Smash, who attempted taking Ryuga away before Sento defeated it as Build. The Touto government quickly arrived and attempted to take Ryuga back into custody. Believing Ryuga's claim that he had been framed, Build helped Ryuga escape from the government, making Build a fugitive as well. That One with the Best Match

Burn Smash Incident and Meeting Night Rogue

Sento hides Ryuga in the secret lab, with Soichi scolding Sento for committing a felony. Sento explained that Ryuga was the 'best match' to his memories as they are both experimented by the same scientist group. On top of that, with exception of the location of the underground lab, Ryuga still had his memories intact. Sento deduced that Ryuga might lead him to the bat man and starts questioning him. Ryuga began the story with his birth, but Sento cut him off, stating not that far and scolded him, infuriating Ryuga and forcing him to shake Sento by the shoulders for insinuating him as an idiot. Sento told Ryuga to just start at the point of his arrest, and Ryuga told them what happened: he showed up at Katsuragi's apartment for a job, but he found him already dead at the same time the cops arrived. Isurugi objected jesterly, finding it strange for the local authorities to arrive just as Ryuga found the body, but Ryuga claims that what happened until a silver booth went off and opened a panel, unveiling the Gorilla Fullbottle. Sento runs toward it and gazed at the bottle before he commented the booth's work, which annoyed Misora as she came out and approached Ryuga, wondering who he was. As Sento theorized that the murder and Ryuga's jailbreak must have a connection until they were approached by Sawa Takigawa, a reporter. Both Sento and Isurugi were shocked as how Sawa found out about them, she showed Sento the Nascita matches set he dropped the night he saved her from the Needle Smash, and Isurugi realized he forgot to close the door behind after Sento brought Ryuga to the lab, but all four were completely unaware that Sawa was a spy for Faust and she knew the lab's entrance, grabbing a match set from a bowl to back up her cover. She then claimed to want to do a cover story on the Kamen Rider, but Sento declined until Isurugi agreed, much to the annoyance of Sento and Misora.

The next day, Sento, as Build, responded to a Smash alert, unaware it was a trap to lure him out by Faust. At the location, Build phones Isurugi to let him know there wasn't a Smash in sight until a squad of Touto Guardians appeared and open fire at Build. Build headed down near the edge of the docks and canceled his transformation, pretending to be an average joe until the Guardians left. At the Touto Institute, Sento ran into Gentoku and a few researchers watching the news as they learned that Touto has declared the Kamen Rider as a fugitive until he received a phone call from Misora, who informed him Ryuga escaped with her phone, both unaware that Ryuga learned that his fiancé, Kasumi Ogura, has been abducted by Faust as well. As Build, Sento tracked Misora's phone to an abandoned warehouse where Ryuga is being pursued by Touto Guardians. Utilizing a Vortex Break with his Drill Crusher gun mode and the Harinezumi bottle, Build asked Ryuga why he left, to which Ryuga stated he has a girlfriend he intended to marry. After defeating the Guardians in the warehouse, Build and Ryuga ran into more Guardians that merged into their Union State and opened fire, forcing Build and Ryuga back into the warehouse. Inside, Build turns into the newly acquired Gorillamond Best Match and proceeded outside, formulating a plan to take down the Guardian Union State, which included knocking Ryuga's motorcycle inside an abandoned building, allowing the Guardian Union State to pursue. As the machine made it to the right spot as its gunfire destabilized the building, Build used the Muscle Glove to destroy the machine.

As they regrouped, Sento asked Ryuga about his fiance, who revealed she was also the one whom sent him to Katsuragi's place for the job. As Sento asked why he didn't say anything, Ryuga punched him in the gut and put him in a chokehold, rendering him unconsciousness to prevent his involvement. However, Sento came to early and managed to catch up and was too late seeing that Kasumi was already transformed into the Burn Smash. As Night Rogue appeared, Sento turned into Build HarinezumiTank Trial Form and fought Rogue to demand answers for his experimentation, but Night Rogue responded that he can't remember every guinea pig Faust had, angering Build. Rouge send Build back with his Steam Blade, telling him he can't beat him with a random bottle. As Build rose, he noticed the Burn Smash preparing to attack Ryuga and pushed him out of the way as the Smash blasted them with a fireball. As Build prepared to fight, Ryuga pleaded to not fight Kasumi, but Build assures him she can be saved once the Smash element has been extracted from her body. However, Rogue intervened and told them if they do that she dies as her Hazard Level is 1, meaning her body's weak and injecting it with the element is fatal as he takes his leave. Build attempts to engage the Smash, but Ryuga stops him until Build spotted the Smash attacking itself. Build stated that when a person becomes a Smash their soul disappears, but Kasumi's soul is still in the Burn Smash as it struggles to not attack Ryuga. Realizing that Kasumi cannot be saved, Build agrees to separate the Smash from Kasumi's soul long enough for Ryuga to say goodbye. first, Build turned into his RabbitSoujiki to absorb all the fire with the Long Range Cleaner, then released the fire with the Trash Converter to create a fire cyclone.

Turning into the GorillaMond Best Match, Build turned the fire into small diamonds and performed a Vortex Finish to place the Burn Smash in a diamond cyclone that separated it from Kasumi's soul. However, he used the Muscle Glove to keep the Smash at bay as he told Ryuga he couldn't do anymore. After Kasumi passed, Build tossed the Smash's body aside to finish the attack and absorbed the element in an empty bottle. As Sento told Ryuga to leave with him, Ryuga broke down with grief and said it's fine if he's incarcerated once more. Angered, Sento reminded him if the authority finds him, he will still be branded as a criminal and Kasumi's life will have been sacrificed for nothing. They headed back to their motorcycles and left the scene. Back at the lab, Sento fell asleep as Misora purifies the Burn Smash bottle, unaware that Ryuga thanked him for letting him see Kasumi one last time until the booth was finished. Upon seeing the newly purified Dragon bottle, Sento tossed it to Ryuga, stating he should hold onto it and to thank Sento after he proved his innocence. Sawa appeared, informing Sento and Ryuga of the man who drugged Ryuga: Masahiro Nabeshima, the same man whom Kasumi mentioned before her death. Now with the connection between the murder and Ryuga's jailbreak, Sento planned to find Nabeshima. The Innocent Runaway

Mirage Smash and Blood Stalk

The next day, Sento explained to Ryuga that Nabeshima was responsible for using Kasumi to make Ryuga Katsuragi's murderer, but also drugging him and placed him in a Smash laboratory. Misora pointed out that finding him would be impossible as his resume was a fake, much to Sawa's sorrow. Misora offered to help find information on Nabeshima, but Ryuga appeared skeptical until Isurugi assured him not to underestimate Misora, who was revealed to be a famous net idol called Miitan. In a matter of minutes, they've received information, but not the right kind: a Smash has appeared. Pausing the search, Sento sets out to intercept the Smash, but Ryuga questioned him whether being a Kamen Rider or finding Nabeshima, the person connected to the Smash and framing Ryuga, was important. Sento states Build is before leaving. Upon taking down the Flying Smash, Sento used the extracted essence to create the Taka Fullbottle. Meanwhile, having obtained Nabeshima's contact information, Ryuga began heading west to Seito with Sawa. Saving Ryuga from a group of Guardians, Sento advised him not to mistake justice for revenge before being attacked by the Mirage Smash. Build neutralized it only to find that the Smash was Nabeshima. Before he had time to react, he was poisoned by Blood Stalk and fell unconscious.

Sento awoke in Nascita's basement, having allegedly been saved by Isurugi.

to be completed

Uncovering Faust

Once again at a dead end, Sento decided to examine Katsuragi's research notes, finding a message to Katsuragi's mother Kyoka in the final one. Escaping another attack from Rogue and Stalk (mainly because Stalk's interference), Sento and Ryuga snuck to Hokuto to speak with Kyoka.

to be completed

Blood Stalk Revealed

"Just now...the Soichi Isurugi I knew died."
―Sento severs his ties with Soichi after learning his true nature.[src]

On the night that Ryuga became Cross-Z officially, Sento was called by Nabeshima, who had regained his memories. Nabeshima revealed he had framed Ryuga on Stalk's orders, and that Isurugi was Stalk. Shaken by this discovery, Sento secluded himself in the basement until Isurugi returned. While reluctant to believe Isurugi was Stalk, Sento created counterfeit Fullbottles to be safe. When confronted with his odd behavior, Sento told them what Nabeshima told him, with the exception of Stalk's true identity.

To test Nabeshima's claim, Sento had Misora purify the Octopus Fullbottle in secret. On a tip from Gentoku, Sento and Ryuga raided a building for Nanba Heavy Industries, where the Pandora Box was being held. Confronted by Stalk, Build and Cross-Z were unable to match Stalk until Sento used the newest Best Match: OctopusLight. Unfamiliar with a Best Match he had never seen, Stalk was easily defeated, confirming Sento's suspicions. The Pandora Box was brought to Nascita, where the group celebrated with dinner. In the middle of the night, Isurugi snatched the Pandora Box, its panel, and the Fullbottle decoys. Before he could leave, Isurugi was confronted by Sento, who had been waiting for him upstairs. After initially running away, Isurugi admitted his ruse and transformed into Stalk to fight.

During the night battle, an essence of Paradox fell into one of Sento's empty bottles and decides to infuse it with the Best Match from a pair of 10 pairs existence after researching on how to use it, resulting on RabbitTank which would be infused after RocketPanda, GorillaMond, and LionCleaner proved to be failure with Ryuga to be the one who tested them all. Sento later challenged Isurugi again, almost to be defeated because of being reluctant until Ryuga came to his aid after distracting Misora by a sudden dating distraction plan from Sento. After Ryuga had lost instead, Isurugi told Sento and Ryuga that the Kamen Rider project is nothing more than a weaponry project and not for becoming heroes of justice. Isurugi also told Sento that he, Misora, and Ryuga were only pawns for the fruition of his plans. Angered, Sento used RabbitTank Sparkling, his completed upgrade, to defeat Stalk and take back the Pandora Box. Isurugi told Sento to search on Takumi's hidden project and claimed that Sento definitely able to finish it and telling that Night Rogue is Gentoku before bidding farewell.

Learning his Past

Sento and Ryuga promptly confronted Gentoku, attempting to get a confession. While Gentoku fought them both off, he advised Sento to look up "Sclash" in Project Build. This hint led Sento to the Sclash Project, the evolution of Project Build. In an excited frenzy, Sento finished the necessary computations within a night. Unbeknownst to Sento, this had been set up by Isurugi as he sneaked into his cafe and copied the data before leaving.

When Gentoku faced and lost against Rabbit Tank Sparkling, Gentoku revealed that Sento was actually Takumi and explained how everything had been set up by Isurugi from behind the scenes.

Overcoming his Guilt

"This is the worst. Having you criticize me...I remember now. I...am a narcissistic-ego driven...hero of justice!"
― Encouraged by Ryuga, Sento regains his confidence as a Kamen Rider.[src]

Sento became overridden with guilt due to Gentoku's words, working silently on the Sclash Driver. Ryuga rushes towards in front of him, knocking over the unfinished driver and addresses Sento that he's responsible for his girlfriend's death and all the people who became Smash. Sento demanded what Rygua wanted, and he replied to fight. As Ryuga gains the upper hand, Sento recalls past events that enforce his true identity as Takumi, until Ryuga notices he wasn't fighting seriously. Obliging to Ryuga's demand to fight for real, Sento changed into RabbitTank Sparkling and finished Ryuga with a Rider Kick. After the battle, Sento shows remorse for his crimes as Takumi and leaves a conflicted Ryuga with Misora watching on.

Hokuto Invasion

One day, Sento received a new pair of Fullbottles: Kuma and Televi, which had been relinquished to Ryuga by Grease as his penance after the Hokuto Three Crows interrupted their battle. Soon after, Sento faced Massugu Ubukata, a man from Hokuto who, in a bid to reclaim the Bottles, held Misora hostage while using a Smash Bottle to become an Ice Smash. Familiar with this kind of Smash, Sento assumed NinninComic Form to fight him as before only to find that its freezing power was greater than the first, leading him to switch to the new Best Match, KumaTelevi. True to its name, the Televi Halfbody provided a television broadcaster whom advised Sento to weaken the ice by introducing an impurity, which he did by infusing it with honey from the Kuma Halfbody before enlarging himself and defeating the Smash with a slash from the Kuma paw. At this point, Build was confronted by Grease, and learnt from Televi-san that Massugu was indebted to Kazumi after he helped save the life of his grandmother. Realizing this, Sento chose to return the Kuma and Televi Fullbottles to Kazumi while suggesting to Massugu that he would do better to go back to Hokuto and continue supporting his grandmother. Kamen Rider Build: Birth! KumaTelevi!! VS Kamen Rider Grease!

"I will stop you. Even if I lose myself!"
―Sento's before transforming to RabbitTank Hazard Form for the first time[src]

Forced to stop the rampaging Cross-Z Charge, Sento used the Hazard Trigger to transform into RabbitTank Hazard. Despite his efforts, Sento was unable to stop Ryuga before the Hazard Trigger's effects took hold, sending him into a mindless rage. Sento easily took out Cross-Z Charge, Akaba, and Kiba before fatally wounding Aoba. Knocked out of his transformation by Grease (who arrived seconds too late), Sento regained consciousness to watch Aoba's death in fear. 

Depressed Sento

Sento, losing his will to fight

The murder left Sento devastated and traumatized: he surrendered all of his Bottles to Touto's government and entered a near-catatonic state.

The next day, Sento was visited by Taizan to inform him about a proxy one on one battle to end the war between Touto and Hokuto for good. Sento had initially refused to fight, however meeting with Soichi changed his mind, having received all the Fullbottles in the possession of both Hokuto and Seito from him.

Sento began work to figure out all the Best Matches in his lab, much to Misora's sadness as she began to worry for Sento. Utsumi then appeared at the lab and reveals he was asked by Soichi to help Sento.

However when Seito attacked, a Bikaiser appeared and began to attack Sento back, but he defeats it with several Best Matches until he realized that it wasn’t Kaisei Mogami, but a random victim sent by Seito. Sento returned home where Misora treated his wounds. After a all-nighter, Sento had created a kill switch for the Hazard Trigger in case he goes out of control. After some thought, he realized the only person he could trust the kill switch with was Misora. He presented it to her the night before the duel, much to her reluctance to accept it.

On the day of the duel, Sento went up against Kamen Rider Grease, who Sento was able to overwhelm for a while with several Best Matches. However Grease was suddenly motivated by an increase of power and began overpowering Build. Sento's is forced to play the RabbitTank Sparkling card from his hand, only to still be overwhelmed by Grease's "passion." Build is hesitant from using the Hazard Trigger for a short moment, before activating it and entering RabbitTank Hazard. However he goes berserk and defeats Grease with no mercy, to the point where he was prepared to kill Kazumi even after his transformation was disengaged. However with Sawa's warning, Ryuga jumps into the ring in order to stop the berserk Build and eventually cancel his transformation. Misora later returns the unused kill switch to Sento.

Victory over Hokuto

However as Kazumi is called back to his homeland to rescue its citizens from the Washio brothers, Sento and Ryuga were given the offer to assist Kazumi, but they decline due to allegiance issues, but they promised to meet them at the Sky Wall once they were done. Kazumi manages to return to Sento and Ryuga with Akaba, however they were followed by the Washio Brothers and engaged in battle with them. Build and Cross-Z are able to push the Washio brothers back and force them to retreat, but not before the sudden appearance of Gentoku Himuro, who had allied with Seito as Kamen Rider Rogue. Rogue easily defeats the combined efforts of Build and Cross-Z without breaking a sweat.

War with Seito

Sento regains his composure after his utter defeat from Rogue, and sent his regards to the deceased citizens of Hokuto, including the Hokuto Three Crows. However Blood Stalk confronts him saying that his own views were not nearly enough to win, much less end this war. Sento is provoked into using the Hazard Trigger against Blood Stalk, and his rampage is luckily stopped by Grease who interfered. After Stalk retreats, Kazumi and Akaba are invited to live at nascita for the time being, and Sento begins questioning his own motives, but reaffirms those beliefs after a pep talk from Misora.

Later the day, the duo receive a call from Prime Minister Himuro, saying their office building was under attack by Seito. Build, Cross-Z, Grease, and Akaba rush to help and encounter Washio brothers in combat. Build personally heads up to the Prime Minister's office in an attempt to protect Pandora's Box, only to encounter Gentoku there, about to take it. He transforms and decides to take the battle with Build somewhere else. They arrive on the outskirts of the Sky Wall, where both Grease and Cross-Z arrive shortly thereafter. To combat Rogue's abilities, Build access Hazard Form but is completely outmatched even in his berserk state. Just as Rogue is about to finish a downed Sento, Misora suddenly appears and reveals the entity inside of her, Vernage, who uses her powers to force the Rogue and the Washio brothers over the Sky Wall back to their own territory. Just before Vernage disappears, she murmurs a name Evolto, and Misora falls unconscious. After bringing her back to nascita, Sento arranges a meeting with Soichi Isurugi to ask him about Evolto, but Soichi claims to not know anything and decides to stay away from Misora, after hearing of her newfound powers. He also drops information that there was a Seito spy within Touto, and reveals that the spy is a member of the Namba Children, children who were adopted by Namba himself and trained both science and espionage while swearing complete loyalty to him. Sento returns to nascita with this information, just when Misora regains consciousness. She has no memory of the attack and hopes to discover what was wrong. Sento helps by pulling the A.I. information from Misora's bangle and her mind, and they discover footage of Pandora's Tower destroying the Martian civilization, presumably from the viewpoint of Vernage's. Misora freaks out, but Sento calms her down and reassures that he will protect Touto and her, and find a way to end the war once and for all.

Ryuga and Sento devise a plan to weed out Seito's spy. By feeding a different location of Pandora's Box to several people, whatever location that the Seito forces would show up, the person who was given that location was the traitor. Build and Cross-Z confront the Washio brothers at the engineering factory, causing them to retreat once they realized the Box wasn't there. Sento and Ryuga return to Prime Minister Himuro's office, and accuse Masuzawa of being the traitor, as he was the one with the location that led to the engineering factory. With his cover blown, he commits suicide. However, the team realize that the true location of the Box was discovered by Gentoku Himuro, who appeared and attacked Akaba, eventually killing him. Grease, Build, and Cross-Z join together to fight Rogue, with Build going Hazard. Build's time of berserk allows Rogue to escape with the Box, and Build turns on Misora. However, Misora's bangle activates, allowing Build to break out of his rampage and regain consciousness, and deactivate his transformation.

War for Pandora's Box

No one should have known the true location of Pandora's Box except the team themselves, and yet Rogue managed to discover the location and escape with the box. With this information in mind, they attempt to uncover the traitor within their midst. They then meet with Prime Minister Himuro, who informs them about the 3-on-3 Proxy Battle with Seito. If Touto loses, then they must surrender their territory and ALL of the Fullbottles in their possession. If they win however, then Seito will cease any further invasion of Touto and restore Hokuto back to its former glory.

Sento begins work on a new upgrade for Build to use during the proxy battle. He stated that Hazard Form's biggest flaw is its increased stimuli overflow, thus causing Build to go berserk. Sento decides to make a new power-up that'll allow him to surpress the overflow stimuli all while keeping the power that Hazard Form can give, and then some. His theory comes from the power that Misora's bangle exhibited, and that it was able to restore Sento's consciousness. After the completion of a white Rabbit Fullbottle, with the help of a reluctant Misora, Sento tries it out on the Build Driver alongside the original Rabbit bottle and the Hazard Trigger, but it results in a explosion, and the test bottle is destroyed. Sawa arrives shortly after and says Kazumi is at Sky Road, so Ryuga goes to find him while Sento and Sawa work on the development of the power-up.

The two compliment each other for their technical skill while talking about Sawa's past. He questions Sawa about her father's past, telling her there were no recorded victims with the name "Takigawa", Sawa replies saying Takigawa was her mother's name. Sento had finally completed the FullFull RabbitTank Bottle and it's accompanying gear, and was about to head out, but he stopped to hear Sawa's story. She revealed to him that her father dying in the gas explosion was a lie, and she herself was one of the Nanba Children. Everything from her being turned into a Smash to being kidnapped by Touto was all part of her plan to gain Sento's sympathy and trust, and if her position was ever compromised, she'd have to commit suicide. However her feelings changed after being with Sento and his friends for so long, it gave her a "family" that she never had. She also revealed that Namba had Nabeshima's family hostage, and wanted Build's upgrade schematics in exchange for their freedom. The two formulate a plan. Sento gives Sawa just RabbitRabbit's data to give to Seito, while keeping TankTank a secret. Sento hurries to the venue of the proxy duel, and Ryuga teases him that Sento may not have to use it. Sento watches as Cross-Z falls to Remecon Bros' deceit. It was then time for Sento to fight against Gentoku Himuro in the final round. To fight Rogue, Sento begins with RabbitTank Sparkling in an attempt to break the even match, however his own motives are questioned by Rogue in an attempt to hypo-criticize him. Sento responded that he fully understood how much of the war was caused by Takumi Katsuragi because of his invention of the Rider System, and felt it was in his responsibility as the instigator of the war to end it. Build then reveals the new Bottle and transforms into RabbitRabbit, which is basically Hazard Form with a new layer of armor. Build in his new form is able to "defeat" Rogue by blasting him out of the venue, however that was not a condition for loss (or win), as Rogue has not given up nor had his transformation disengaged. After receiving RabbitRabbit Form's data, Gentoku gained the upper hand and continued to ramble on about his ambition and how it was the only thing he felt he could rely on, and quickly rejected Sento's idea of "love and peace". In the midst of battle, Sawa receives a call from Kazumi, saying the Nabeshima family were now safe. Giving Sento the signal, Build immediately transforms into TankTank Form and outwits Rogue, reaffirming that even though "love and peace" may not be the ideal form of belief in the reality they were currently in, it at least gave him the strength to fight for a new world. With Gentoku fighting Build blind from TankTank Form, Build is able to defeat Rogue by transformation disengagement, and secure victory for Touto. Prime Minister Himuro appears to congratulate Sento and attempt to bring Gentoku back to Touto, he however bitterly walks off, leaving Sento in worry. The team regroups after the match. Misora slaps but hugs Sawa. Sento thanks Kazumi for helping, but he takes the honor instead.

Seito's Betrayal

With Pandora's Box in Seito's hands, Blood Stalk activates the first full panel of Fullbottles on the Box and raises the first Level of Pandora's Box. With Seito now serious about an all out war, Build, Cross-Z, and Grease attempt to make their stand against the new Hard Guardians. News break out that Touto was the loser of the battle, and that Taizan Himuro was the one who was unwilling to stand down. In this new situation, the team attempt to figure out their next move. Kazumi wants to go back to Hokuto, but Sento said it was useless now that they were in a warzone. The team head out to battle the Washio brothers the very next day with newfound resolve, however in the midst of battle, Misora is held hostage and is ransomed for the team's bottles. However at that moment, Vernage reawakens and reveals her title as the Queen of Mars. Vernage forces Soichi and the Washio brothers to retreat, and the team treat Queen Vernage to a cup of coffee at nascita. Vernage reveals that her body was long gone, and her soul will not last forever in Misora's bangle. She also reveals that Evolto will eventually use the Pandora's Box to destroy Earth, just like he did with Mars. She then questions Ryuga's identity, saying he will be their final hope, before falling unconsciousness. The team head to the lab to discuss what Vernage said. Ryuga claims his childhood memories were vague. He picks up the rock that contained the essence of his former Sclashjelly and it begins to catch on fire. He drops it and it transforms into a new Fullbottle. Realizing something, Sento asks Sawa to look into Ryuga' background and decides to create a power-up for Ryuga using the newly created Fullbottle. After Sento finishes, both Misora and him walk out to discuss Vernage and ways to end the war.

Pandora's Tower

The next day, Sento's sudden resignation from Touto's military forces had charged him with treason. This, however, is all part of Sento's plan to enter Seito and retrieve Pandora's Box without triggering any allegiance issues. Build rides his bike to the Tower while being ambushed by Hard Guardians, but not without backup from Cross-Z and Grease. The three make their way into the Tower, but were met with the Washio Brothers and some Hard Guardians. During the fight, Build gives Cross-Z his newest weapon, the Cross-Z Magma Knuckle. Blood Stalk appears and manipulates the ground, due to his influence over the Pandora's Box. Later, Gentoku as Rogue would join the battle as well, with Cross-Z attacking him first but is defeated. Build heads to fight Rogue, but during the midst of battle, Rogue reveals that due to a chip implanted in him, he is forced to obey Seito's commands, and reveals that Masakuni Mido is in fact dead, and that Juzaburo Namba has impersonated him. He asks Sento to take back the Pandora Box to prevent Juzaburo Namba from taking over the entire world. Rogue intentionally lets Build defeats him, and Gentoku reverts out of Rider form. Considering Gentoku's words, Sento, Ryuga, and Kazumi had to the center of the Tower and confront Stalk who has the power of the Box under his control. Stalk summons two Clone Smashes to fight Build and Grease, while Cross-Z engages in combat with Stalk. Ryuga is defeated, and Sento rushes in to protect him from a blast that would have killed Ryuga, and ends up going down as well. As Sento is helplessly in Stalk's hands, Ryuga awakens his true potential and transforms into Cross-Z Magna and attacks Stalk, while Sento watches. Ryuga is successfully able to defeat the Clone Smash, drive Stalk away, secure the Box, and get the team out of there.

Sento brings the Box to Prime Minister Himuro and asks him to use the Box to negotiate and end the war. Sento and the Riders return to nascita, where Sawa then reveals Ryuga's extraterrestrial origins to everyone and that the man responsible behind it was Takumi's father, Shinobu Katsuragi. At first Ryuga doesn't believe it at first, but Sento reminds him that Cross-Z was somehow about to calm Pandora's Box using the same power as Stalk. Sento also cases on the fact that Ryuga's alien power was reset when he was born, and his alien origins would explain Ryuga's abnormal increases of Hazard Level. Sawa is then confused on why information like this was not "top secret", as her retrieval of the information was rather easy.

Sento is then called to Area D4, where he meets Grease to fight against the Washio brothers. The fight went well, with the Washio Brothers in defeat, however they were decoy to lure Build and Grease away from the Touto government offices, leaving it defenseless for Stalk to plunder. Sento hurries to the government building and finds Ryuga there already. He re-encourages Ryuga to stand up, and watches him fight Blood Stalk as Cross-Z Manga. He manages to drive Stalk away, but the two then realize that by fighting Stalk, they allowed Rogue to get into Prime Minister Himuro's office. By the time Sento and Ryuga arrive, Rogue had already left with his father.

Evolto's Plan

The team returns to nascita to discuss further options. Sento receives a call from Soichi, who demands the Evol-Driver that Takumi Katsuragi hid, in exchange for PM Himuro's life. Looking for a clue to where the Driver may be, Sento finds the file his father wrote and pulls it up. The file reveals that Evolto has taken over Soichi Isurugi and that he is the only one able to use the Evol-Driver. Sento recognizes the Driver's gear work and is able to find the Driver disassembled in the Fullbottle purifier. Sento then receives a call from Gentoku, who wishes to have Sento disable the chip inside of him so that he can help him get his father back. The next day, Sento and Ryuga arrive at the trade, with Misora and Sawa standby outside. Sento wants Stalk to hand Himuro over first, but Stalk insists Sento is in no position to make demands considering the situation. Then, Rogue, now with his chip disabled, appears and runs out with his father, while Build and Cross-Z stay behind to fight the Clone Smash. After defeating them, they go outside only to find that Evolto has trasnformed into Kamen Rider Evol, and Taizan Himuro dead. Realizing the imminent threat, Build, Cross-Z, and Grease enter battle with Evol. Sento however is defeated and poisoned by Evol, who said Sento has only three days left to live and the only antidote is with him. Sento is taken to the ICU and follows through with the plan for Ryuga to defeat Evol and cure Sento. Ryuga is able to defeat Evol, thus curing Sento. However Evolto takes this opportunity to possess Ryuga and access Evol's Dragon-based Phase 2 form.

In the midst of their despair, Evolto takes this chance to enter the central building and steal Pandora's Box, only for Sento to give chase in an attempt to stop him from doing so. Sento transforms into Build and battles Evol while he reveals his entire plan from the very beginning, including how Ryuga came to be and Evol's plans for him. In the end, Sento is utterly defeated and brought back to nascita to rest. After he woke up, he revealed that during his time poisoned, he had a dream that Ryuga was calling for help, and vowed to honor that. Realizing that Gentoku has the final Fullbottle needed for Evolto to open the box, he calls Gentoku to nascita to cooperate in protecting the last bottle. However Evolto shows up and teleports everyone to the core of Pandora's Tower. Evolto activates another completed panel and raises the second level of Pandora's Tower. In that moment, Build, Grease, and Rogue enter battle with Evol. Rogue attempts to distract Evol in order for Build to grab a panel and retrieve the bottles, however the plan fails and results in both Rogue and Grease getting flung out of the Tower.

Sento resorts to using the bottles for regular Hazard Forms in concession to battle Evolto, while being criticized of reverting back to his old tactics. After entering KeyDragon Hazard, Evol decides to enter Evol Dragon Phase 2. At that moment, Sento begins feel the stimuli taking over, but he suppresses with TankTank form. Evol begins to tell Build that science is the key to humanity's destruction, but Build retorts that people aren't so simple that they would so easily allow destruction to happen as they have the power to prevent it in the first place. Build is able to put Evol on the ground, however Evol impersonates Ryuga's voice, allowing Evol to attack Build back and defeat him. Sento helplessly watches as Evol inserts the third and fourth panels onto the Box, allowing the Tower to absorb the Sky Wall debris. Sento cries out as Evol activates the fifth panel, allowing for the Tower to complete itself. Evolto uses the power of all the Fullbottles to create an incomplete version of the Evol Trigger, which he activates to no avail. Then, Vernage appears and teleports her, Sento, and Pandora's Box back to nascita.

Back at the base, Vernage reveals how she began her stand against Evolto at her planet's destruction and says Evolto cannot be allowed to reach his true and final form. To help, she uses her power to restore the Fullbottles' essence, which prompts Sento to somehow figure out that the Panels can be used to help engineer Build's final power-up. However using it is fatal, which causes Misora to berate Sento about not taking care of his own life. Sento promises Misora that he'll come back.

Sento and Grease are called out to an attack at Touto by Seito, where Evolto leads several Hard Guardians to attack the public. Build as RabbitRabbit attacks Evolto with a concession of Fullbottle attacks where he is able to overwhelm Evol, but he changes to his more gracile Evol Dragon, and Sento responds with TankTank. The two exchange conversation that Evol thinks humanity is at fault for this war, but Sento believes the humans have the power to prevent it. At the brink of defeat, Build brings out the Fullbottle-shaped Panel power-up, and affirms that it's for the best, to protect his friends and end this war. He sets the power-up onto his Driver and begins cranking the lever. Evol approaches him but is knocked back after revealing that Build is now at Hazard Level 6. Evol is pleased as he reveals that the plan was going well. Evol strikes his hand inside Sento and releases Ryuga. At that moment, Build began to crank the lever once more, continuously raising his Hazard Level. Evol knows that if Build continues to do this, he will die, but Sento was prepared to take Evolto with him. The two explode, leaving only a white-haired Sento. Ryuga wakes up and tries to wake Sento up, only to reveal that Evolto has taken him over. With Sento, Evolto creates the Rabbit Evolbottle and transforms into Evol Rabbit, Phase 3.

Possession by Evolto

With Sento now in Evolto's possession, he attempted to activate the Evol Trigger, only to no avail, saying that the humans aren't strong enough to handle the power of Pandora Box. Ryuga attempts to transform into Cross-Z Magma, but Evolto tells him that because Ryuga left Evolto, he no longer has any of his essence left, and therefore cannot transform. Grease decides to try, but is utterly defeated. As Evolto attempts to leave, Ryuga follows but is knocked down before he could continue. Evolto returns to nascita, only to find the entire shop "gone" and immediately figured it was Vernage's doing.

After Evol gains his complete form, Black Hole Form, Sento is jettisoned from Evolto, only to be rescued by Ryuga. However, the result is that his memories of Takumi Katsuragi resurfaces, while his memories of being Sento are now gone.

Memory Resurfacing

Resurfacing with Takumi's memories, he is surprised that Evolto has reached his final form and watches the other Riders fight Evolto again. Shortly however, Gentoku realized that they were outpowered and forced the entire team to retreat back to nascita.

Back at nacita, Takumi is overwhelmed by his new look and continuously wonders how this was even scientifically possible. He began to scribble over his marker board while overhearing the others discussing his nickname "The Devil's Scientist", saying "devil" was uncalled for. He recognized Misora Isurugi as the girl whom he had purifying Fullbottles for while he was with Faust, all in the name of science. Takumi began to wonder why Ryuga Banjo was helping him, despite him having Evolto's DNA, and believes that even if the DNA was gone, Evolto could still awaken inside.

Takumi is called out to talk by Gentoku Himuro, and the two exchange words on how Gentoku misused the Rider System for war. Gentoku apologized and said the Pandora Box altered his mindset, but Takumi didn't want to hear excuses since it was undeniable that it was them both that were responsible for the war. Takumi knew that even though Gentoku wanted to use the Kamen Riders for war, he convinced himself it was solely to stop Evolto's upcoming attack, and that the sacrifices made were necessary. In the end, Takumi walks away, saying he never should have trusted Gentoku.

Later, the team enter Evolto's space of creation to help Utsumi on his request to stop Evolto. However, Takumi is unable to keep up with Build RabbitRabbit form as it was too high-performance for him. Evolto comments that Takumi will never be able to use the latest version of Build, but Takumi proclaims that he can and he will, because he built Build for the sole purpose of beating Evolto. Takumi attempts to use the Pandora Box panel, but is froze still by the electrical output of it. Evolto takes this chance to punch him back and force him out of his transformation. Evolto takes the later chance to kill both Rai Washio and Fu Washio, thus Takumi becomes angry to see lives being lost in front in him. Evolto hands Utsumi a Evol Driver and he transforms into Kamen Rider Mad Rogue, where he fights Gentoku. Gentoku is defeated and Grease arrives in the nick of time to help the team escape.

Back at nascita, the team pounders on what to do now that Evolto has voiced his intent to take over the country for himself, and they want to investigate why Evolto now wants to rule a planet rather than destroy it. Takumi wishes to complete the new power-up item to defeat Evolto, along with Ryuga, who is beginning to have episodes of Evolto's memories surfacing in him. Later that night, Takumi completes the Genius Bottle and is confident he can defeat Evolto and Ryuga. Misora berates him for not believing in his friends, but Takumi said friends can only lead to distrust and betrayal. The next day, Takumi hears Gentoku regretting his actions in the past and wants to make it up and asks the team to believe in him.

Takumi heads out to "help" Cross-Z and Grease with RabbitRabbit Form, now modified to fit his specs, and easily defeats the Clone Smash. He fights MadRogue to an equal standstill, but is knocked back when Utsumi questions his motives for science. Takumi reveals the Genius Bottle and tries to use it, but it wouldn't activate. Theoretically, he should be able to use it, but Takumi didn't know why he couldn't, as MadRogue attacks him and forces him out of his transformation. Ryuga arrives to fight MadRogue and tells Takumi that Sento fought for justice and was the epitome of a superhero, traits that Takumi didn't have. Watching MadRogue force Ryuga out of Rider form, Takumi experiences a flow of memories coming into his mind. Takumi then appears in front of Sento, and asks him if he believed in the power of trust and friendship. Sento responds with a smile, and Takumi asks Sento to show him the future he can build. Takumi and Sento join hands, and the two assimilate with each other into Sento.

Two Minds, Now United as One

With both the memories of Takumi and himself, Sento appears to tease Ryuga for losing, which the latter responds with an equally as witty remark. Declaring the return of the egotistic superhero, he reveals the Genius Bottle and successfully activates it into his Build Driver, thus giving birth to Kamen Rider Build's final form, Genius Form. Immediately, Build begins to overwhelm Mad Rogue with intense speed and power, even crushing the Nebulasteam Gun to nothingness and bringing the battle to a obvious victory. Evolto appears and is impressed by Build's new power. He attacks and takes the Lost Bottles in Kazumi's possession, saying he wants to take over the world with them.

Personality

"Me and him...We fought to become strength for others. To protect people...we kept rising back up. Even without you...I still have people to protect. For the justice I believe in...I will defeat you!"
―Sento proving his justice to Blood Stalk.[src]
Sento's outstanding traits are his intellect, narcissism, and sense of justice. A genius by all standards, Sento has repeatedly displayed advanced knowledge in physics, mathematics, chemistry, engineering, and cryptography.

Sento's polymathism is accompanied by an inflated ego and sharp tongue: he likes to praise himself for his works, and often mocks Ryuga for his comparatively lower intelligence. Sento often relies on his own skills to solve problems and never expects sudden assistance from others, so when it happens, he tends to either be surprised or turns them down. Also, Sento can be easily caught off guard when he accomplishes anything or witnesses something unexpected and new which excites him, because of his reliance on his intellect. In this state, he is vulnerable to any surprise attacks.

Sento can be easily attracted to anything that is mysterious and interesting, such as new innovations and anything that brings him closer to uncovering his past, and will relentlessly pursue it. This will continue until either he reaches a conclusion or someone forcibly stops him during progress. When Sento gets excited (usually due to a discovery or breakthrough), a part of his hair sticks up.

Sento's greatest trait is his sense of justice. A firm pacifist, he believes that science should be used for the sake of humanity, and harshly opposes using it for war. His selflessness and sense of duty causes him to try and shoulder the burden alone rather than involve others, whether he can carry that burden or not. This altruism intensifies the guilt he feels for his role in creating the Smash and escalating the war. While generally calm and composed, Sento is prone to making poor judgement during emotional turmoil.

Sento has a couple of catchphrases. Before he transforms, he says "Now, shall we begin the experiment?" (さあ、実験を始めようか? Sā, jikken o hajimeyou ka?). In Kamen Rider Build: Be The One, he says a variant of this catchphrase, "Now, shall we begin the final experiment?" (さあ、最後の実験を始めようか? Sa, saigo no jikken o hajimeyou ka). After transforming, he says "The rules of victory is set." (勝利の法則は決まった Shōri no hōsoku wa kimatta).

Powers and Abilities

Current Powers

  • High Hazard Level Physiology: Sento underwent an experiment from Faust which injected him with a certain amount of Nebula Gas. However, instead of mutating into a Smash, the gas retained his body without side affects apart from memory loss (mostly inflicted by Blood Stalk). As result, his initial Hazard Level starts at Level 3, which allows subjects like him to utilize the Build Driver to transform into Kamen Rider Build. Later, his Hazard level rose to 3.7 due to his anger during the battle against Blood Stalk. After continuous usage of the RabbitTank Sparkling Fullbottle, his Hazard level rose to 3.9; and after continuous use of the Hazard Trigger, his hazard level was at 4.4 according to Blood Stalk, last time it was measured. By using a panel from the Pandora Box in the Build Driver, Sento was able to raise his Hazard Level to 6, a feat that should not be possible for a human being. Soon after he raised it to 6.3+ by cranking the Build Driver's Vortex Lever.
  • Genius-Level Intellect: Sento's most defining trait is his intelligence. He has an advanced knowledge of physics, and developed several of Build's accessories on his own. Since regaining his memories of Takumi Katsuragi, his intellect has combined with the latter as well.
    • Genius Physicist: Sento has an advanced knowledge of physics, having finished a difficult physics test with perfect results. This proves a significant asset in battle, which Sento incorporates into his fighting technique.
    • Genius Engineer: Sento has built the majority of Build's accessories, as well as all of Cross-Z's equipment, on his own.
    • Strategist: Sento has shown himself to be a capable strategist, being able to outwit Blood Stalk on two occasions as well as Namba.
  • English Language Proficiency: Sento is able to read Shinobu Katsuragi's entire file and perfectly translate it back to Japanese verbally.
  • Fullbottle Augmentation: By shaking a Fullbottle in his hand without transforming, Sento can gain abilities based on said Fullbottle's traits:
    • Rabbit: Allows Sento to gain fast reflexes. First used to defeat Ryuga Banjo in a one-on-one fight.
    • Gorilla: Allows Sento to perform fiery punches. First used to fight Ryuga Banjo.
  • Fourth Wall Interaction: Used only for comical purposes, Sento is capable of interacting with Ryuga's recollection of his birth in various ways. This normally involves said recollection being thrown away or knocked off-screen somehow.

Weaknesses

  • Dragon Fullbottle: As seen in episode 10, Sento's body cannot handle the Dragon Fullbottle's power as he transforms into Build KeyDragon, which causes him to be electrified by the energy surges and experiences intense pain. Further use of the Dragon Bottle causes his body to be engulfed in flame-like energy which hurts him even more and forcibly knocks Sento out of his transformation. This was due to Ryuga's Hazard Level 3 synchronizing more effectively with the Dragon Full Bottle from prolonged use and exposure to its energy, while Sento had never used it before, and hence lacked that immunity.
  • Form Data: As seen on Utsumi's tablet, Namba has data on most of Build's Best Match forms, including tactical data for countering them, as well as data/tactical counters on RabbitRabbit form to use against Sento as shown in the fight with Rogue. Hypothetically, any of Sento's forms can be countered, provided they're analyzed, and the opponent is powerful enough to utilize the counter(s).
  • Hazard Trigger: If Sento uses the Hazard Trigger for too long, it will overstimulate his nervous system and send him into a mindless rampage, destroying anything and anyone in his path until his transformation is cancelled. Raising Sento's Hazard Level appears to prolong the time he can use the Trigger with his consciousness intact. Sento is later able to overcome the effects of the Hazard Trigger by using it along with the FullFull RabbitTank Bottle.
  • Hazard Kill Switch (Formerly): With Utsumi's help, Sento designed a switch that would allow the user to overload the Hazard Trigger should Sento ever lose control while using it. Activating the switch would destroy the Hazard Trigger, killing Sento in the process. However, after creating the FullFull RabbitTank Bottle, it was no longer needed.

Forms

Sento sets two different Fullbottles into the Build Driver and turns the crank to transform into Kamen Rider Build. Kamen Rider Build, like Kamen Riders Double and OOO before him, can assume a variety of different forms, called Trial Forms (トライアルフォーム Toraiaru Fōmu), using different combinations of Fullbottles. However, each one has a Best Match (ベストマッチ Besuto Matchi) with another Fullbottle that creates an especially powerful form. Best Matches usually have unique names in comparison to other mismatched forms, and the caps of Fullbottles indicate what Fullbottle is its Best Match. The additional use of the Hazard Trigger upgrades a Best Match into a Super Best Match (スーパベストマッチ Supā Besuto Matchi).

Build initiates a finishing attack by turning the Build Driver's Vortex Crank again. The finisher of all Trial Forms is called the Vortex Attack (ボルテックアタック Borutekku Atakku), while the finisher of the Best Matches is called the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu). The finisher of the Super Best Matches is called the Hazard Finish (ハザードフィニッシュ Hazādo Finisshu).

Main article: Kamen Rider Build (Rider)

In any form that uses the Rabbit Fullbottle, Build is armed with the Rabbit Foot Shoes (ラビットフットシューズ Rabitto Futto Shūzu) on his left leg for increased jumping.

RabbitTank Form
KRBu-Buildrabbittank

RabbitTank Form

"Rabbit! Tank! Best Match! Are you ready? (Techno rock music) Hagane no moonsault! RabbitTank! Yeahhh!"
―RabbitTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 196.0 cm
  • Rider Weight: 99.0 kg

Ability Parameters:

  • Punching Power: 9.9 tons (right arm)/17.0 tons (left arm)
  • Kicking Power: 23.7 tons (right leg)/17.8 tons (left leg)
  • Maximum Jump Height: 55.0 m
  • Maximum Running Speed: 100 m. per 2.9 sec.

RabbitTank Form (ラビットタンクフォーム Rabitto Tanku Fōmu) is Build's red and blue primary and default Best Match form form accessed from the Rabbit and Tank Fullbottles, hence known as the Moonsault of Steel (鋼のムーンサルト Hagane no Mūnsaruto). It is a Touto Best Match, and is themed after a rabbit and a tank.

RabbitTank is Build's most balanced form, having a good amount of both power and agility. Thus, it is Build's default form, despite Sento being able to transform with any two of Build's Fullbottles. This is also Build's second fastest form.

In this Best Match form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat surface.

This form's weapon is the Drill Crusher.

As a Best Match, this form has two finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build dives underground to send a white energy chart flying up to the surface with the dotted line securing the enemy before leaping back up, and delivering a kick whilst riding the chart's line. According to Blood Stalk, this finisher has a Hazard Level of 3.2, and then 3.7 when Build attacks him out of anger.
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク Borutekku Bureiku):
      • Blade: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
        • Organic:
          • Rabbit: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a red energy slash.
          • Gorilla: The Drill Spiral Blade cloaks itself in an energy projection that bears a striking resemblance to the Muscle Glove.
          • Ninjya: Purple energy Drill Spiral Blades are projected and spin violently around the Drill Crusher.
        • Inorganic:
          • Rocket: The Drill Crusher charges at the enemy and attacks like a rocket.
      • Gun: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful blast.
        • Harinezumi: Build shoots white energy spikes at the enemy.

Appearances: Build Episodes 1-2, Transformation Lessons: Kamen Rider Build Chapter, Build 3, 5-7, 10, 13 (flashback), 14, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15-17, Birth! KumaTelevi!! VS Kamen Rider Grease!, Build 21-25, 30, Be The One

RabbitSoujiki Form
KRBu-Buildrabbitsoujiki

RabbitSoujiki Form

"Rabbit! Soujiki! Are you ready? (Funky music)"
―RabbitSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 196.0 cm
  • Rider Weight: 93.7 kg

Ability Parameters:

  • Punching Power: 7.9t (right arm)/5.7t (left arm)
  • Kicking Power: 9.6t (right leg)/14.2t (left leg)
  • Maximum Jump Height: 38.4m
  • Maximum Running Speed: 100m. per 3.9 sec

RabbitSoujiki Form (ラビット掃除機フォーム Rabitto Sōjiki Fōmu) is Build's red and turquoise Trial Form accessed through the Rabbit and Soujiki Fullbottles, themed after a rabbit and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This Trial Form gives Build the ability to absorb any elemental attacks using the Long Range Cleaner, and safely disarm the accumulated attack using the Trash Converter. However, this comes at the cost of all of his Ability Parameters being decreased from RabbitTank.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 2

RabbitGatling Form
KRBu-Buildrabbitgatling

RabbitGatling Form

"Rabbit! Gatling! Are you ready? (Funky music)"
―RabbitGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 196.0 cm
  • Rider Weight: 95.0 kg

Ability Parameters:

  • Punching Power: 7.9 t (right arm)/8.0 t (left arm)
  • Kicking Power: 10.8 t (right leg)/14.2 t (left leg)
  • Maximum Jump Height: 37.7m
  • Maximum Running Speed: 100m. per 6.2 sec

RabbitGatling Form (ラビットガトリングフォーム Rabitto Gatoringu Fōmu) is Build's red and gray Trial Form accessed through the Rabbit and Gatling Fullbottles, themed after a rabbit and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger and Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 4

Trial Forms
"Rabbit! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Gorilla Fullbottle, Build is armed with the Muscle Glove (マッスルグローブ Massuru Gurōbu) on his right arm for enhanced punching.

GorillaMond Form
KRBu-Buildgorillamond

GorillaMond Form

"Gorilla! Diamond! Best Match! Are you ready? (Tropical rock music) Kagayaki no destroyer! GorillaMond! Yeahhh!"
―GorillaMond's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 112.0 kg

Ability Parameters:

  • Punching Power: 25.9 tons (right arm)/15.8 tons (left arm)
  • Kicking Power: 17.3 tons (right leg)/16.5 tons (left leg)
  • Maximum Jump Height: 32.5 m
  • Maximum Running Speed: 100 m. per 8.4 sec.

GorillaMond Form (ゴリラモンドフォーム Goriramondo Fōmu) is Build's brown and cyan second Best Match form accessed from the Gorilla and Diamond Fullbottles, hence known as the Shining Destroyer (輝きのデストロヤー Kagayaki no Desutoroyā). It is a Touto Best Match, and is themed after a gorilla and a diamond.

In this Best Match form, Build is armed with the BLD Prism Glove (BLDプリズムグローブ BLD Purizumu Gurōbu) on his left hand.

GorillaMond shows an increase in power, as the Punching Power of Build is significantly higher than in RabbitTank, albeit with a slightly decreased amount in its left arm, but it lacks Kicking Power and agility compared to RabbitTank. His left arm can convert inorganic objects, or even weakened enemies, into diamonds.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): This finisher has two variations:

  • Build uses the BLD Prism Glove creates a gust full of diamonds and uses the Muscle Glove to punch them at the enemy. The diamond then creates a tornado that causes a human to separate from his/her Smash form, then Build punches the Smash inside the tornadoes, thereby defeating the Smash.
  • Build stops an enemy's projectile attack in mid-air with the BLD Prism Glove, altering the projectiles' atomic structure into a diamond shield. He then punches the shield with the Muscle Glove, shattering it and sending the shards flying at the enemy at high speeds.

Appearances: Build Episode 2, Transformation Lessons: Kamen Rider Build Chapter, Build 3-4, 6

GorillaSoujiki Form
KRBu-Buildgorillasoujiki

GorillaSoujiki Form

"Gorilla! Soujiki! Are you ready? (Funky music)"
―GorillaSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 111.7 kg

Ability Parameters:

  • Punching Power: 20.7 tons (right arm)/5.7 tons (left arm)
  • Kicking Power: 9.6 tons (right leg)/13.2 tons (left leg)
  • Maximum Jump Height: 26.5 m
  • Maximum Running Speed: 100 m. per 6.2 sec.

GorillaSoujiki Form (ゴリラ掃除機フォーム Gorira Sōjiki Fōmu) is Build's brown and turquoise Trial Form accessed through the Gorilla and Soujiki Fullbottles, themed after a gorilla and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 3

GorillaRocket Form
KRBu-Buildgorillarocket

GorillaRocket Form

"Gorilla! Rocket! Are you ready? (Funky music)"
―GorillaRocket's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 115.0 kg

Ability Parameters:

  • Punching Power: 20.7 tons (right arm)/11.6 tons (left arm)
  • Kicking Power: 13.5 tons (right leg)/13.2 tons (left leg)
  • Maximum Jump Height: 32.5 m
  • Maximum Running Speed: 100 m. per 9.1 sec.

GorillaRocket Form (ゴリラロケットフォーム Gorira Roketto Fōmu) is Build's brown and light blue Trial Form accessed through the Gorilla and Rocket Fullbottles, themed after a gorilla and a rocket.

In this Trial Form, Build is armed with the Space Ride Arm (スペースライドアーム Supēsu Raido Āmu) on his left arm that can fly off as a rocket and ram the opponent, and let him fly.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 8

Trial Forms
"Gorilla! (Inorganic Fullbottle name)! Are you ready?"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Taka Fullbottle, Build is armed with the Solstall Wings (ソレスタルウィング Soresutaru Wingu) on his back that grant him the ability to fly, along with the Hawk Gatlinger. [2]

HawkGatling Form
KRBu-Buildhawkgatling

HawkGatling Form

Kamen Rider Build HawkGatling Form (Extended Wings)

Extended wings

"Taka! Gatling! Best Match! Are you ready? (Brass band music) Tenkuu no abarenbou! HawkGatling! Yeahhh!"
―HawkGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 193.0 cm
  • Rider Weight: 107.0 kg

Ability Parameters:

  • Punching Power: 9.7 tons (right arm)/10.0 tons (left arm)
  • Kicking Power: 13.5 tons (right leg)/14.2 tons (left leg)
  • Maximum Jump Height: 41.7 m
  • Maximum Running Speed: 100 m. per 5.8 sec.

HawkGatling Form (ホークガトリングフォーム Hōku Gatoringu Fōmu) is Build's orange and gray Best Match form accessed with the Taka and Gatling Fullbottles, hence known as the Rampage of the Skies (天空の暴れん坊 Tenkū no Abarenbō). It is a Touto Best Match, and is themed after a hawk and a gatling gun.

While this Best Match has low stats compared to RabbitTank, this is made up for by the Solstall Wings on his back which grant him flight capabilities, as well as the utilization of the Gatling Fullbottle's Hawk Gatlinger that was designed for this particular Best Match.

As a Best Match, this form has two finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu).
  • Hawk Gatlinger finisher:
    • Full Bullet (フルブレット Furu Buretto): Build spins the Revol-Magazine ten times causing the gun to surround itself and its wielder with a white energy spherical graph that traps all enemies in mid-air before firing upon them all.

Appearances: Build Episodes 3-5, 8-10, 13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 16, 20, 24

Trial Forms
"Taka! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Ninjya Fullbottle, Build wields the 4Koma Ninpoutou. It also grants Build the Onmitsu Scarf (オンミツスカーフ Onmitsu Sukāfu) on the right side of his back.

NinninComic Form
KRBu-Buildninnincomic

NinninComic Form

"Ninjya! Comic! Best Match! Are you ready? (Surfer rock music) Shinobi no entertainer! NinninComic! Yeahhh!"
―NinninComic's transformation announcement[src]

Rider Statistics

  • Rider Height: 194.0 cm
  • Rider Weight: 90.5 kg

Ability Parameters:

  • Punching Power: 11.1 t (right arm)/8.8 t (left arm)
  • Kicking Power: 10.1 t (right leg)/22.2 t (left leg)
  • Maximum Jump Height: 45.4 m
  • Maximum Running Speed: 100m. per 4.2 sec

NinninComic Form (ニンニンコミックフォーム Ninnin Komikku Fōmu) is Build's purple and yellow Best Match form accessed with the Ninjya and Comic Fullbottles, hence known as the Stealthy Entertainer (忍びのエンターテイナー Shinobi no Entāteinā). It is a Touto Best Match, and is themed after a ninja and a comic book.

This form grants Build well-balanced abilities akin of RabbitTank. Furthermore, it has increased kicking and punching power with the cost of jumping power and speed. The 4Koma Ninpoutou was designed for this particular Best Match. This is also Build's fourth fastest form.

As a Best Match, this form has several finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu)
  • 4Koma Ninpoutou finishers:
    • Clone Jutsu (分身の術 Bunshin no Jutsu, Art of Cloning): Build presses the Vortex Trigger one time and creates a number of clones of himself that attack together.
    • Fire Jutsu (火遁の術 Katon no Jutsu, Art of Fire Releasing): Build presses the Vortex Trigger two times and delivers a flaming slash attack. While performing this attack, the 4Koma Ninpoutou announces Blazing Slash (火炎斬り Kaen Giri).
    • Wind Jutsu (風遁の術 Fūton no Jutsu, Art of Wind Releasing): Build presses the Vortex Trigger three times and creates a tornado around the blade. While performing this attack, the 4Koma Ninpoutou announces Tornado Slash (竜巻斬り Tatsumaki Giri).
    • Stealth Jutsu (隠れ身の術 Kakuremi no Jutsu, Art of Camouflage): Build presses the Vortex Trigger four times and teleports a short distance away in a puff of smoke. While performing this attack, the 4Koma Ninpoutou announces Doron (ドロン Doron, lit. "Abscond"), with a heavy drumbeat when he disappears and reappears.

Appearances: Build Episodes 5-7, 9, 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders[3], Build 16, Birth! KumaTelevi!! VS Kamen Rider Grease!, Build 20

NinjyaTank Form
KRBu-Buildninjyatank

NinjyaTank Form

"Ninjya! Tank! Are you ready? (Funky music)"
―NinjyaTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 194.0 cm
  • Rider Weight: 101.1 kg

Ability Parameters:

  • Punching Power: 8.9 t (right arm)/13.6 t (left arm)
  • Kicking Power: 19.0 t (right leg)/17.8 t (left leg)
  • Maximum Jump Height: 32.3 m
  • Maximum Running Speed: 100m. per 2.3 sec

NinjyaTank Form (忍者タンクフォーム Ninja Tanku Fōmu) is Build's purple and blue Trial Form accessed through the Ninjya and Tank Fullbottles, themed after a ninja and a tank.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot, as well as the Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 6

Trial Forms
"Ninjya! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Panda Fullbottle, Build is armed with the Giant Scratcher (ジャイアントスクラッチャー Jaianto Sukuracchā) claws on his right hand.

RocketPanda Form
KRBu-Buildrocketpanda

RocketPanda Form

"Panda! Rocket! Best Match! Are you ready? (Orchestra music) Buttobi monotone! RocketPanda! Yeahhh!"
―RocketPanda's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 114.0 kg

Ability Parameters:

  • Punching Power: 18.8 t (right arm)/14.5 t (left arm)
  • Kicking Power: 16.9 t (right leg)/15.4 t (left leg)
  • Maximum Jump Height: 43.6 m
  • Maximum Running Speed: 100m. per 8.5 sec

RocketPanda Form (ロケットパンダフォーム Roketto Panda Fōmu) is Build's snow white and light blue Best Match form accessed with the Rocket and Panda Fullbottles, hence known as the Flying Monotone (ぶっ飛びモノトーン Buttobi Monotōn). It is a Touto Best Match, and is themed after a panda and a rocket.

In this Best Match form, Build is armed with the Space Ride Arm (スペースライドアーム Supēsu Raido Āmu) on his left arm that can fly off as a rocket and ram the opponent, and let him fly.

This form grants Build a balanced boost in punching, kicking and jumping power, albeit his speed is the slowest of all forms so far.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build surrounds the enemy with a white, oval-shaped energy chart, then uses the Space Ride Arm to fly at the enemy and performs a series of slashes with the Giant Scratcher. The chart goes up as Build continues to slash the enemy.

Appearances: Build Episode 7-8, 15, 18, 20

PandaGatling Form
KRBu-Buildpandagatling

PandaGatling Form

"Panda! Gatling! Are you ready? (Funky music)"
―PandaGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 112.0 kg

Ability Parameters:

  • Punching Power: 15.0 t (right arm)/8.0 t (left arm)
  • Kicking Power: 10.8 t (right leg)/12.3 t (left leg)
  • Maximum Jump Height: 26.6 m
  • Maximum Running Speed: 100m. per 8.6 sec

PandaGatling Form (パンダガトリングフォーム Panda Gatoringu Fōmu) is Build's snow white and gray Trial Form accessed through the Panda and Gatling Fullbottles, themed after a panda bear and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 7

Trial Forms
"Panda! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Harinezumi Fullbottle, Build is armed with the Spine Knuckle (スパインナックル Supain Nakkuru) on his right fist, allowing him to clobber foes with spikes that extend outwards when used. When first used after transforming, the spines notably appear to fly in from the surroundings to the Spine Knuckle, only extending from it on subsequent attacks.

FireHedgehog Form
KRBu-Buildfirehedgehog

FireHedgehog Form

"Harinezumi! Syoubousya! Best Match! Are you ready? (Rock music with sirens) Rescue kenzan! FireHedgehog! Yeahhh!"
―FireHedgehog's transformation announcement[src]

Rider Statistics

  • Rider Height: 190.0 cm
  • Rider Weight: 103.7 kg

Ability Parameters:

  • Punching Power: 13.7 tons (right arm)/11.9 tons (left arm)
  • Kicking Power: 14.7 tons (right leg)/14.0 tons (left leg)
  • Maximum Jump Height: 36.5 m
  • Maximum Running Speed: 100 m. per 6.4 sec.

FireHedgehog Form (ファイヤヘッジホッグフォーム Faiya Hejjihoggu Fōmu) is Build's white and scarlet-colored Best Match form accessed from the Harinezumi and Syoubousya Fullbottles, hence known as the Rescue Kenzan (レスキュー剣山 Resukyū Kenzan). It is a Touto Best Match, and is themed after a hedgehog and a fire engine.

In this Best Match form, Build is armed with the Multi Deluge Gun (マルチデリュージガン Maruchi Deryūji Gan) on his left arm that can shoot water, fire, or extend.

This form give build balanced boost in punching, kicking and jumping power, albeit at the cost of his running speed.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build extends the Multi Deluge Gun and uses it to stab the enemy, then fills them up with water and surrounds them with a white energy chart before jumping up such that he's perpendicular with the ground, then dropping down, and punching the enemy with the Spine Knuckle.

Appearances: Build Episode 8, 10, 15, 19

HarinezumiTank Form
KRBu-Buildharinezumitank

HarinezumiTank Form

"Harinezumi! Tank! Are you ready? (Funky music)"
―HarinezumiTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 194.0 cm
  • Rider Weight: 102.7 kg

Ability Parameters:

  • Punching Power: 11.0 tons (right arm)/13.6 tons (left arm)
  • Kicking Power: 19.0 tons (right leg)/11.2 tons (left leg)
  • Maximum Jump Height: 28.4 m
  • Maximum Running Speed: 100 m. per 7.0 sec.

HarinezumiTank Form (ハリネズミタンクフォーム Harinezumi Tanku Fōmu) is Build's white and blue Trial Form accessed through the Harinezumi and Tank Fullbottles, themed after a hedgehog and a tank.

Compared to RabbitTank, this Trial Form has a stronger amount of Punching Power in its right arm, while being weaker in the left. The rest of the Ability Parameters are overall much worse in comparison.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

Appearances: Build Episodes 1-2

Trial Forms
"Harinezumi! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Lion Fullbottle, Build is armed with the Gold Lio Gauntlet (ゴルドライオガントレット Gorudo Raio Gantoretto) on his right arm that lets him shoot bursts of yellow energy by punching.

LionCleaner Form
KRBu-Buildlioncleaner

LionCleaner Form

"Lion! Soujiki! Best Match! Are you ready? (Techno rock music) Tategami cyclone! LionCleaner! Yeah!"
―LionCleaner's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 104.3 kg

Ability Parameters:

  • Punching Power: 17.4 tons (right arm)/7.1 tons (left arm)
  • Kicking Power: 12.0 tons (right leg)/21.3 tons (left leg)
  • Maximum Jump Height: 39.0 m
  • Maximum Running Speed: 100 m. per 3.6 sec.

LionCleaner Form (ライオンクリーナーフォーム Raion Kurīnā Fōmu) is Build's marigold and turquoise Best Match form accessed with the Lion and Soujiki Fullbottles, hence known as the Mane Cyclone (鬣サイクロン Tategami Saikuron). It is a Touto Best Match, and is themed after a lion and a vacuum cleaner.

In this Best Match form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This form grants Build a balanced boost in all his ability parameters. This is also Build's third fastest form.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build uses the Long Range Cleaner to suck the enemy towards him, holding it in place, before coating the Gold Lio Gauntlet in yellow energy, then firing off an energy lion head that bites the opponent on contact.

Though Build possessed both Fullbottles needed for this form for an extended time and seemingly knew of their Best Match, he didn't use them until much later, likely because Lion was always being used for the Machine Builder.

Appearances: Build Episodes 9-10, 15

LionComic Form
KRBu-Buildlioncomic

LionComic Form

"Lion! Comic! Are you ready? (Funky music)"
―LionComic's transformation announcement[src]

Rider Statistics

  • Rider Height: 194.0 cm
  • Rider Weight: 99.0 kg

Ability Parameters:

  • Punching Power: 13.9 tons (right arm)/7.0 tons (left arm)
  • Kicking Power: 8.1 tons (right leg)/17.0 tons (left leg)
  • Maximum Jump Height: 32.8 m
  • Maximum Running Speed: 100 m. per 5.6 sec.

LionComic Form (ライオンコミックフォーム Raion Komikku Fōmu) is Build's marigold and yellow Trial Form accessed with the Lion and Comic Fullbottles, themed after a lion and a comic book.

In this Trial Form, Build is armed with the 4Koma Ninpoutou.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku)

This form is exclusive to Kamen Rider Build Episode 15

Trial Forms
"Lion! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Dragon Fullbottle, Build can make powerful punches and scratches with his right hand augmented by blue flames. Any form using this Fullbottle tends to be unstable, due to its immense power and close tuning to Ryuga instead of Sento.

Its power is so strong that even its Best Match configuration cannot stabilize it for long, and Build can be forced out of his transformation and get injured.

KeyDragon Form
KRBu-Buildkeydragon

KeyDragon Form

"Dragon! Lock! Best Match! Are you ready? (Fantasy-themed music) Fūin no fantasy star! KeyDragon! Yeahhh!"
―KeyDragon's transformation announcement[src]

Rider Statistics

  • Rider Height: 196.0 cm
  • Rider Weight: 108.0 kg

Ability Parameters:

  • Punching Power: 19.7 tons (right arm)/16.9 tons (left arm)
  • Kicking Power: 17.6 tons (right leg)/24.1 tons (left leg)
  • Maximum Jump Height: 47.4 m
  • Maximum Running Speed: 100 m. per 5.1 sec.

KeyDragon Form (キードラゴンフォーム Kī Doragon Fōmu) is Build's navy and gold Best Match form accessed with the Dragon and Lock Fullbottles, hence known as the Sealed Fantasy Star (封印のファンタジースター Fūin no Fantajī Sutā). It is a Touto Best Match, and is themed after a dragon and a lock.

This form grants Build a significant parameter boost along with jumping power, albeit at a cost in running speed. Despite its tremendous power, this form also possesses a drawback of a potential overload due to the Dragon Fullbottle's strong synchronization with Ryuga.

In this Best Match Form, Build is armed with the Bind Master Key ( バインドマスターキー Baindo Masutā Kī) on his left arm which can be used as a battering weapon due to its weight.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build fires several chains from the Bind Master Key to bind the opponent in place before creating and throwing a powerful dark blue fireball, that detonates upon impact.

Appearances: Build Episode 10-11

Trial Forms
"Dragon! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Kaizoku Fullbottle, Build wields the Kaizoku Hassyar.

KaizokuRessya Form
KRBu-Buildkaizokuressya

KaizokuRessya Form

"Kaizoku! Densya! Best Match! Are you ready? (Pirate-themed string music) Teikoku no hangyakusha! KaizokuRessya! Yeahhh!"
―KaizokuRessya's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 95.8 kg

Ability Parameters:

  • Punching Power: 12.0 tons (right arm)/12.7 tons (left arm)
  • Kicking Power: 15.0 tons (right leg)/13.8 tons (left leg)
  • Maximum Jump Height: 39.4 m
  • Maximum Running Speed: 100 m. per 2.5 sec.

KaizokuRessya Form (海賊レッシャフォーム Kaizoku Ressha Fōmu, lit. PirateTrain Form)[4] is Build's azure and lime green Best Match form accessed with the Kaizoku and Densya Fullbottles, hence known as the Punctual Rebel (定刻の反逆者 Teikoku no Hangyakusha). It is a Touto Best Match, and is themed after a pirate and a train.

Being based on a train, this form is Build's fastest Best Match form, only being outpaced by Trial Form NinjyaTank by 0.2 seconds. The Kaizoku Hassyar was designed for this Best Match.

In this form, Build is armed with the Train Gauntlet (トレインガントレット Torein Gantoretto) on his left arm for increased speed.

Using the Kaizoku Hassyar, Build can perform three different special attacks by pulling back the Build Arrow and holding it before letting go. Charging the Kaizoku Hassyar escalates its shot through three of the four tiers. While performing any of this attacks, the Kaizoku Hassyar announces Shuppatsu (出発 lit. Departure).

As a Best Match, this form has three finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu):
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク Borutekku Bureiku):
      • Blade: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
        • Kaizoku: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a double azure energy slash.
  • Kaizoku Hassyar finisher:
    • Kaizoku Densya (海賊電車 lit. Pirate Train): It is charged by pulling back the Build Arrow and holding it before letting go. While performing this finisher, the Kaizoku Hassyar announces Hassha (発射 lit. Fire).
      • Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well.

Appearances: Build Episodes 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders[5], Build 15, 19

KaizokuGatling Form
KRBu-Buildkaizokugatling

KaizokuGatling Form

"Kaizoku! Gatling! Are you ready? (Funky music)"
―KaizokuGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 98.1 kg

Ability Parameters:

  • Punching Power: 9.6 tons (right arm)/8.0 tons (left arm)
  • Kicking Power: 10.8 tons (right leg)/11.0 tons (left leg)
  • Maximum Jump Height: 33.1 m
  • Maximum Running Speed: 100 m. per 6.7 sec.

KaizokuGatling Form (海賊ガトリングクフォーム Kaizoku Gatoringu Fōmu) is Build's azure and gray Trial Form accessed through the Kaizoku and Gatling Fullbottles, themed after a pirate and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger. Even though Build didn't use the Hawk Gatlinger in the debut episode, a scan shows that he does use it in this form.[6]

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 16

Trial Forms
"Kaizoku! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special. KaizokuSyoubousya specifically was almost used in Build Episode 8, but Sento decided otherwise upon seeing it wasn't a Best Match.



In any form that uses the Octopus Fullbottle, Build is armed with the Twist Lash Arm (ツイストラッシュアーム Tsuisuto Rasshu Āmu) on his right shoulder that can be used to bind his opponents.

OctopusLight Form
KRBu-Buildoctopuslight

OctopusLight Form

"Octopus! Light! Best Match! Are you ready? (Electronic music) Inazuma technician! OctopusLight! Yeahhh!"
―OctopusLight's transformation announcement[src]

Rider Statistics

  • Rider Height: 193.5 cm
  • Rider Weight: 96.5 kg

Ability Parameters:

  • Punching Power: 4.4 tons (right arm)/4.8 tons (left arm)
  • Kicking Power: 8.6 tons (right leg)/8.0 tons (left leg)
  • Maximum Jump Height: 42.1 m
  • Maximum Running Speed: 100 m. per 6.5 sec.

OctopusLight Form (オクトパスライトフォーム Okutopasu Raito Fōmu) is Build's magenta and light yellow Best Match form accessed with the Octopus and Light Fullbottles, hence known as the Lightning Technician (稲妻テクニシャン Inazuma Tekunishan). It is a Touto Best Match, and is themed after an octopus and a light bulb.

This is Build's weakest Best Match form in terms of ability parameters. However, his jumping power and speed is on average. As such, Build is restricted to OctopusLight's special abilities to win fights.

In this Best Match form, he is armed with the Shade Breaker (シェードブレイカーム Shēdo Bureikā) and the BLD Light Bulb Shoulder (BLDライトバルブショルダー Birudo Raito Barubu Shorudā), which can both be used together to create lightning in order to attack his opponents.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build fires an orb of jet-black ink from the head of the Twist Lash Arm that traps the enemy before snaring them with its tentacles, then using both the Shade Breaker and BLD Light Bulb Shoulder to shock the trapped enemy via a punching maneuver.

Appearances: Build Episode 13-14, 16

Trial Forms
"Octopus! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Phoenix Fullbottle, Build is armed with the Flame Reviber (フレイムリヴァイバー Fureimu Rivaibā) gauntlet on his right arm for pyrokinesis and Empirial Wings (エンパイリアルウィング Enpairiaru Uingu) on his back that grant him the ability to fly.

PhoenixRobo Form
KRBu-Buildphoenixrobo

PhoenixRobo Form

"Phoenix! Robot! Best Match! Are you ready? (Dark classical music) Fujimi no heiki! PhoenixRobo! Yeahhh!"
―PhoenixRobo's transformation announcement[src]

Rider Statistics

  • Rider Height: 191.0 cm
  • Rider Weight: 112.3 kg

Ability Parameters:

  • Punching Power: 15.7 tons (right arm)/28.8 tons (left arm)
  • Kicking Power: 23.4 tons (right leg)/16.8 tons (left leg)
  • Maximum Jump Height: 43.6 m
  • Maximum Running Speed: 100 m. per 6.4 sec.

PhoenixRobo Form (フェニックスロボフォーム Fenikkusu Robo Fōmu) is Build's vermillion and gunmetal gray Best Match form accessed with the Phoenix and Robot Fullbottles, hence known as the Immortal Weapon (不死身の兵器 Fujimi no Heiki). It is a Hokuto Best Match, and is themed after a phoenix and a robot.

In this Best Match form, Build is armed with the Demolition One (デモリションワン Demorishon Wan) on his left hand for dismantling and crushing targets, which connected to the BLD Arsenal Shoulder (BLDアーセナルショルダー Bī Eru Dī Āsenaru Shorudā) on his left shoulder that allows him to turn dismantled objects into his personal robot troops.

Stat-wise, this Best Match is significantly stronger than all previous Best Matches, and its punching power even surpasses RabbitTank Sparkling. In this form, Build handled the Hokuto Three Crows quite easy, which is something he couldn't do with RabbitTank Sparkling.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build covers himself in a bird-shaped flame before ramming the enemy into the air, then flies after the enemy before repeatedly ramming into it.

This form debuts in Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders after Soichi Isurugi gives Sento its Fullbottles, going on to appear in the series and specials.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 18, Raising the Hazard Level ~7 Best Matches~: First Chapter

PhoenixSoujiki Form
KRBu-Buildphoenixsoujiki

PhoenixSoujiki Form

"Phoenix! Soujiki! Are you ready? (Funky music)"
―PhoenixSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 191.0 cm
  • Rider Weight: 98.0 kg

Ability Parameters:

  • Punching Power: 12.6 tons (right arm)/5.7 tons (left arm)
  • Kicking Power: 9.6 tons (right leg)/13.4 tons (left leg)
  • Maximum Jump Height: 37.9 m
  • Maximum Running Speed: 100 m. per 3.8 sec.

PhoenixSoujiki Form (フェニックス掃除機フォーム Fenikkusu Sōjiki Fōmu) is Build's vermillion and turquoise Trial Form accessed through the Phoenix and Soujiki Fullbottles, themed after a phoenix and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

Appearances: Build Episodes 19, 21

Trial Forms
"Phoenix! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Wolf Fullbottle, Build is armed with the Wolfatal Claw (ウルフェイタルクロー Urufeitaru Kurō) on his right arm for channeling animal instinct.

SmaphoWolf Form
KRBu-Buildsmaphowolf

SmaphoWolf Form

"Wolf! Smapho! Best Match! Are you ready? (Classic rock music) Tsunagaru ippiki ookami! SmaphoWolf! Yeahhh!"
―SmaphoWolf's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 91.6 kg

Ability Parameters:

  • Punching Power: 16.6 tons (right arm)/5.2 tons (left arm)
  • Kicking Power: 10.4 tons (right leg)/20.8 tons (left leg)
  • Maximum Jump Height: 41.6 m
  • Maximum Running Speed: 100 m. per 5.1 sec.

SmaphoWolf Form (スマホウルフフォーム Sumaho Urufu Fōmu) is Build's silver and blue Best Match form accessed with the Wolf and Smapho Fullbottles, hence known as the Connected Lone Wolf (繋がる一匹狼 Tsunagaru Ippiki Ōkami). It is a Hokuto Best Match, and is themed after a wolf and the Build Phone.

In this Best Match form, Build is armed with the Build Pad Shield (ビルドパッドシールド Birudo Paddo Shīrudo) on his left arm for either defending capabilities or selecting a recommended attack enhancement. Although the Build Pad Shield cracks upon sustaining a strong attack, it can repair itself. Befitting its identical appearance to the Build Phone, the Build Pad Shield can also function in the same manner, with the exception of Bike Mode.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build surrounds himself with a ring of energy smartphone icons before a black energy wolf shadow circles it, leaps out, and rams into any enemy within the ring.

Appearances: Build Episode 18

Trial Forms
"Wolf! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Rose Fullbottle, Build is armed with the Ibalash Arm (イバラッシュアーム Ibarasshu Āmu) on his right arm for manipulating plant vines or firing thorn projections.

RoseCopter Form
KRBu-Buildrosecopter

RoseCopter Form

"Rose! Helicopter! Best Match! Are you ready? (Spanish music) Jounetsu no senpuki! RoseCopter! Yeahhh!"
―RoseCopter's transformation announcement[src]

Rider Statistics

  • Rider Height: 190.0 cm
  • Rider Weight: 94.2 kg

Ability Parameters:

  • Punching Power: 6.3 tons (right arm)/12.9 tons (left arm)
  • Kicking Power: 14.4 tons (right leg)/10.6 tons (left leg)
  • Maximum Jump Height: 42.8 m
  • Maximum Running Speed: 100 m. per 5.6 sec.

RoseCopter Form (ローズコプターフォーム Rōzu Koputā Fōmu) is Build's vermillion and turquoise Best Match form accessed with the Rose and Helicopter Fullbottles, hence known as the Fan of Passion (情熱の扇風機 Jōnetsu no Senpūki). It is a Hokuto Best Match, and is themed after a rose and a helicopter.

In this Best Match form, Build is armed with the Batrotor Blade (バトローターブレード Batorōtā Burēdo) which he can use to fly, or alternatively, use as a weapon.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): This finisher has two variations:

  • Build removes the Batrotor Blade from his back, then covers it in red energy rose vines as it starts spinning before flying at the enemy for a slashing attack.The Unstoppable Hazard
  • During an experimental test conducted by Sento and Nariaki, Build flies with the Batrotor Blade on his back as he catches any escaping targets with the vine summoned by the Ibalash Arm before dragging his target to the spinning rotor to be sliced with.Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: First Chapter

Appearances: Build Episode 21, Raising the Hazard Level ~7 Best Matches~: First Chapter, Build 22

RoseSoujiki Form
KRBu-Buildrosesoujiki

RoseSoujiki Form

"Rose! Soujiki! Are you ready? (Funky music)"
―RoseSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 190.0 cm
  • Rider Weight: 93.2 kg

Ability Parameters:

  • Punching Power: 5.0 tons (right arm)/5.7 tons (left arm)
  • Kicking Power: 9.6 tons (right leg)/8.5 tons (left leg)
  • Maximum Jump Height: 31.8 m
  • Maximum Running Speed: 100 m. per 5.7 sec.

RoseSoujiki Form (ローズ掃除機フォーム Rōzu Sōjiki Fōmu) is Build's vermillion and turquoise Trial Form accessed through the Rose and Soujiki Fullbottles, themed after a rose and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This Trial Form gives Build the ability to absorb any elemental attacks using the Long Range Cleaner, and safely disarm the accumulated attack using the Trash Converter.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 21

RoseSyoubousya Form
KRBu-Buildrosesyoubousya

RoseSyoubousya Form

"Rose! Syoubousya! Are you ready? (Funky music)"
―RoseSyoubousya's transformation announcement[src]

Rider Statistics

  • Rider Height: 190.0 cm
  • Rider Weight: 99.5 kg

Ability Parameters:

  • Punching Power: 5.0 tons (right arm)/9.5 tons (left arm)
  • Kicking Power: 11.8 tons (right leg)/8.5 tons (left leg)
  • Maximum Jump Height: 30.1 m
  • Maximum Running Speed: 100 m. per 5.0 sec.

RoseSyoubousya Form (ローズ消防車フォーム Rōzu Shōbōsha Fōmu) is Build's vermillion and scarlet Trial Form accessed through the Rose and Syoubousya Fullbottles, themed after a rose and a fire engine.

In this Trial Form, Build is armed with the Multi Deluge Gun (マルチデリュージガン Maruchi Deryūji Gan) on his left arm that can shoot water, fire, or extend.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 25

Trial Forms
"Rose! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Tora Fullbottle, Build is armed with the BLD Tora Fight Glove (BLDトラファイトグローブ Bī Eru Dī Tora Faito Gurōbu) on his right hand for slashing attacks, and the Jungle Foot Shoes (ジャングルフットシューズ Janguru Futto Shūzu) for leaping at the enemy at blurring speeds for a split second.[7]

ToraUFO Form
KRBu-Buildtoraufo

ToraUFO Form

"Tora! UFO! Best Match! Are you ready? (Jungle music) Mikakunin jungle hunter! ToraUFO! Yeahhh!"
―ToraUFO's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.0 cm
  • Rider Weight: 100.5 kg

Ability Parameters:

  • Punching Power: 17.8 tons (right arm)/5.1 tons (left arm)
  • Kicking Power: 8.7 tons (right leg)/21.2 tons (left leg)
  • Maximum Jump Height: 46.5 m
  • Maximum Running Speed: 100 m. per 3.9 sec.

ToraUFO Form (トラユーフォーフォーム Tora Yūfō Fōmu) is Build's marigold and pink Best Match form accessed with the Tora and UFO Fullbottles, hence known as the Unidentified Jungle Hunter (未確認ジャングルハンター Mikakunin Janguru Hantā). It is a Seito Best Match, and is themed after a tiger and a UFO.

In this form, This form grants Build a balanced boost in all his ability parameters akin to LionCleaner. He is also armed with the Inbay Dodge Shoes (インベイダッジシューズ Inbei Dajji Shūzu) that can generate a pink, energy UFO beneath him for hovering capabilities.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build generates a pink, energy UFO that rams into any enemy before sucking them up and shredding them to pieces.

Appearances: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

Trial Forms
"Tora! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Kujira Fullbottle, Build is armed with the Navy Chest Armor (ネイビーチェストアーマー Neibī Chesuto Āmā) for protection against water pressure, and the BLD Spout Glove (BLDスパウトグローブ Bī Eru Dī Supauto Gurōbu) on his right hand for a water-based shooting attack.

KujiraJet Form
KujiraJetScan

KujiraJet Form

"Kujira! Jet! Best Match! Are you ready? (Tropical music) Amakakeru big wave! KujiraJet! Yeahhh!"
―KujiraJet's transformation announcement[src]

KujiraJet Form (クジラジェットフォーム Kujira Jetto Fōmu) is Build's navy and cyan Best Match form accessed with the Kujira and Jet Fullbottles, hence known as the Big Wave Flying through the Sky (天駆けるビッグウェーブ Amakakeru Biggu Wēbu). It is a Seito Best Match, and is themed after a whale and a jet plane.

As a Best Match, this form has two finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build floods the area in front of him and goes underwater, then a giant whale comes up and boosts Build with its blowhole allowing Build to fly out of the water, and perform a powerful kick at the enemy.
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク Borutekku Bureiku):
      • Gun: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful blast.
        • Sensuikan: Build shoots some torpedoes at the enemy.

Appearances: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

KujiraSyoubousya Form
KRBu-Buildkujirasyoubousya

KujiraSyoubousya Form

"Kujira! Syoubousya! Are you ready? (Funky music)"
―KujiraSyoubousya's transformation announcement[src]

Rider Statistics

  • Rider Height: 189.5 cm
  • Rider Weight: 120.0 kg

Ability Parameters:

  • Punching Power: 14.4 tons (right arm)/9.5 tons (left arm)
  • Kicking Power: 11.8 tons (right leg)/20.4 tons (left leg)
  • Maximum Jump Height: 28.8 m
  • Maximum Running Speed: 100 m. per 7.0 sec.

KujiraSyoubousya Form (クジラ消防車フォーム Kujira Shōbōsha Fōmu) is Build's navy and scarlet-colored Trial Form accessed from the Kujira and Syoubousya Fullbottles. It is themed after a whale and a fire engine.

This form is exclusive to Kamen Rider Build Episode 25

Trial Forms
"Kujira! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.



In any form that uses the Kirin Fullbottle, Build can slash the opponent with the giraffe neck on his right hand.

KirinCyclone Form
KirinCycloneScan

KirinCyclone Form

"Kirin! Senpuki! Best Match! Are you ready? (Techno rock music) Arashi o yobu kyotou! KirinCyclone! Yeahhh!"
―KirinCyclone's transformation announcement[src]

KirinCyclone Form (キリンサイクロンフォーム Kirin Saikuron Fōmu) is Build's gold and baby blue Best Match form accessed with the Kirin and Senpuki Fullbottles, hence known as the Towering Storm-Caller (嵐を叫ぶ巨塔 Arashi o Yobu Kyotō). It is a Seito Best Match themed after a giraffe and an electric fan.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ Borutekku Finisshu): Build flies to the enemy with his fan arm, then summons an energy giraffe neck and attacks the enemy with it.

Appearances: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

Trial Forms
"Kirin! (Inorganic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.




RabbitTank Sparkling Form
KRBu-Buildrabbittanksparkling

RabbitTank Sparkling Form

"RabbitTank Sparkling! Are you ready? (Techno rock music) Shuwatto hajikeru! RabbitTank Sparkling! Yea-Yeahhh!"
―RabbitTank Sparkling's transformation announcement[src]

Rider Statistics

  • Rider Height: 202.0 cm
  • Rider Weight: 102.1 kg

Ability Parameters:

  • Punching Power: 14.9 tons (right arm)/25.5 tons (left arm)
  • Kicking Power: 35.6 tons (right leg)/26.7 tons (left leg)
  • Maximum Jump Height: 66.0 m
  • Maximum Running Speed: 100 m. per 2.0 sec.

RabbitTank Sparkling Form (ラビットタンクスパークリングフォーム Rabitto Tanku Supākuringu Fōmu) is Build's carbonated soda upgrade form accessed with the RabbitTank Sparkling Fullbottle.

RabbitTank Sparkling, in comparison to RabbitTank, is a giant leap of improvement, literally. It can run faster than KaizokuRessya, jump higher than RabbitTank, and has a nice assortment of offensive power parameters, with the right leg boasting more power then any of Build's previously introduced forms.

This form allows Build to use the Drill Crusher, Hawk Gatlinger, 4Koma Ninpoutou and Kaizoku Hassyar without restrictions.

This form has two finishers:

  • Build Driver finisher:
    • Sparkling Finish (スパークリングフィニッシュ Supākuringu Finisshu): This finisher has three variations:
      • Build delivers a powerful, bubbly kick attack at the enemy
      • Build leaps high into the air before creating a red and blue, spiraling, hourglass-shaped vortex resembling a wormhole. He then dives down through the wormhole, and kicks. The wormhole is also capable of sucking in and disintegrating opponents' attacks.
      • Build delivers a powerful, bubbly kick attack at the enemy from behind in close range.
  • Kaizoku Hassyar finisher:
    • Kaizoku Densya (海賊電車 lit. Pirate Train): It is charged by pulling back the Build Arrow and holding it before letting go. While performing this finisher, the Kaizoku Hassyar announces Hassha (発射 lit. Fire).
      • Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well.
  • Build Driver + Drill Crusher finisher:
    • Sparkling Finish/Vortex Break (スパークリングフィニッシュ/ボルテックブレイク Supākuringu Finisshu/Borutekku Bureiku): After plugging a Fullbottle into the Full Bottle Slot of the Drill Crusher, Build can perform a powerful, bubbly finisher.
      • Blade: Build channels the energy of a Full Bottle in his Drill Crusher and performs a powerful slash.
        • Kabutomushi: The Drill Spiral Blade cloaks itself in an energy projection resembling a rhinoceros beetle's horn and performs a powerful, bubbly stab attack.

Appearances: Build Episode 14, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15-20, Raising the Hazard Level ~7 Best Matches~: Final Chapter, 22-25, 27

"Are you ready? (Techno rock music) Uncontrol switch! Black hazard! Yabei!"
―Hazard Form transformation announcement[src]

By attaching the Hazard Trigger to the Build Driver, Build can upgrade any of his Best Match forms into a Hazard Form. This results in a base Hazard Form body with the eyes of the Best Match used. While Hazard Forms lack the unique equipment of a normal Best Match's Halfbodies, they still retain some access to their specific powers, and can use any handheld weapon tied to that Best Match.

The Hazard Trigger grants a massive strength, capable of destroying even a Hazard Smash with little effort, but usage of it puts the user at risk of losing self-awareness and going on a destructive rampage.

All of Build's forms accessed with the Hazard Trigger are armed with the HZ Deadly Gloves and HZ Vanish End Shoes.

RabbitTank Hazard Form
KRBu-Buildrabbittankhazard

RabbitTank Hazard Form

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg

Ability Parameters:

  • Punching Power: 19.8 tons (right arm)/34.0 tons (left arm)
  • Kicking Power: 47.4 tons (right leg)/35.6 tons (left leg)
  • Maximum Jump Height: 77.0 m
  • Maximum Running Speed: 100 m. per 1.4 sec.

RabbitTank Hazard Form (ラビットタンクハザードフォーム Rabitto Tanku Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading RabbitTank Form with the Hazard Trigger.

In this form, Build's stats greatly surpass any other form, Rider, or Smash up to its appearance.

This form has two finishers:

  • Overflow (オーバーフロー Ōbāfurō): This finisher has two variations:
    • Build transfers surplus Nebula Gas into his HZ Deadly Gloves (HZデッドリーグローブ HZ Deddorī Gurōbu) and throws powerful punches and kicks. Additionally, Build also can simply touch the enemy for about several seconds to deliver electricity that paralyze the enemy.
    • Build rushes at the enemy at maximum speed
  • Hazard Finish (ハザードフィニッシュ Hazādo Finisshu): This finisher has two variations:
    • Build coats his right HZ Vanish End Shoe (HZヴァニッシュエンドシューズ HZ Vanisshu Endo Shūzu) in purple, dark energy before delivering a powerful side kick.
    • Build rushes towards the enemy and performs a flying kick.

Appearances: Build Episodes 20- 21, Raising the Hazard Level ~7 Best Matches~: Final Chapter, Build 22-26

SmaphoWolf Hazard Form
KRBu-Buildwolfsmapho Hazard

SmaphoWolf Hazard Form

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg

SmaphoWolf Hazard Form (スマホウルフハザードフォーム Sumaho Urufu Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading SmaphoWolf Form with the Hazard Trigger.

From the Tu-Ka Face Module (ツーカーフェイスモジュール Tsūkā Feisu Mojūru) (the phone icon on the right eye), Build is able to send a series of energy projections of app icons which encircle the enemy, disorienting and attacking them.

This forms has three finisher:

  • Build Driver finishers:
    • Overflow (オーバーフロー Ōbāfurō): Build transfers surplus Nebula Gas into his HZ Deadly Gloves (HZデッドリーグローブ HZ Deddorī Gurōbu) and delivers a powerful punch, summoning a wolf-like energy projection which "bites" down on the enemy.
    • Hazard Finish (ハザードフィニッシュ Hazādo Finisshu):
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク Borutekku Bureiku):
      • Blade: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
        • Unicorn: An energy projection resembling a unicorn's horn spins around the Drill Crusher as Build performs a powerful stab attack.

This form is exclusive to Raising the Hazard Level ~7 Best Matches~: First Chapter.

HawkGatling Hazard Form
KRBu-Buildhawkgatlinghazard

HawkGatling Hazard Form

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg

Ability Parameters:

  • Punching Power: 19.4 tons (right arm)/20.4 tons (left arm)
  • Kicking Power: 27.0 tons (right leg)/28.4 tons (left leg)
  • Maximum Jump Height: 58.4 m
  • Maximum Running Speed: 100 m. per 2.9 sec.

HawkGatling Hazard Form (ホークガトリングハザードフォーム Hōku Gatoringu Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading HawkGatling Form with the Hazard Trigger.

Build is armed with the Hawk Gatlinger in this form. He can also summon the Solstall Wings for flight if needed.

This form has two finishers:

  • Overflow (オーバーフロー Ōbāfurō): Build performs a series of blasts with the Hawk Gatlinger while flying around the enemy with the Solstall Wings.
  • Hazard Finish (ハザードフィニッシュ Hazādo Finisshu): Build traps the enemy in a black cloud and performs a series of purple blasts with the Hawk Gatlinger.

This form is exclusive to Episode 22

KaizokuRessya Hazard Form
KRBu-Buildkaizokuressyahazard

KaizokuRessya Hazard Form

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg

Ability Parameters:

  • Punching Power: 24.0 tons (right arm)/25.4 tons (left arm)
  • Kicking Power: 30.0 tons (right leg)/27.6 tons (left leg)
  • Maximum Jump Height: 55.2 m
  • Maximum Running Speed: 100 m. per 1.3 sec.

KaizokuRessya Hazard Form (海賊レッシャハザードフォーム Kaizoku Ressha Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading KaizokuRessya Form with the Hazard Trigger.

Build is armed with the Kaizoku Hassyar in this form.

This form has two finishers:

  • Overflow (オーバーフロー Ōbāfurō): Build repeatedly punches the enemy with his HZ Deadly Gloves delivering purple shockwaves on impact.
  • Hazard Finish (ハザードフィニッシュ Hazādo Finisshu):

Appearances: Build Episode 24, 35

KeyDragon Hazard Form
KRBu-Buildkeydragonhazard

KeyDragon Hazard Form

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg

Ability Parameters:

  • Punching Power: 39.4 tons (right arm)/33.8 tons (left arm)
  • Kicking Power: 35.2 tons (right leg)/48.2 tons (left leg)
  • Maximum Jump Height: 66.4 m
  • Maximum Running Speed: 100 m. per 2.5 sec.

KeyDragon Hazard Form (キードラゴンハザードフォーム Kī Doragon Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading KeyDragon Form with the Hazard Trigger.

Build is armed with the Beat Closer in this form.

This form has two finishers:

  • Overflow (オーバーフロー Ōbāfurō): Build repeatedly punches the enemy with his HZ Deadly Gloves delivering purple shockwaves on impact.
  • Hazard Finish (ハザードフィニッシュ Hazādo Finisshu):

Appearances: Build Episode 35

By using the FullFull RabbitTank Bottle alongside the Hazard Trigger, Build can upgrade the sleek, black Hazard Form into either RabbitRabbit Form or TankTank Form. The FullFull RabbitTank Bottle was designed to give Build an immense power boost over Hazard Form while suppressing the stimulus overflow that causes Build to go berserk. Build's weapon in these forms is the Fullbottle Buster.

The ending theme for both RabbitRabbit Form and TankTank Form is entitled "Ready Go!!".

RabbitRabbit Form
KRBu-Buildrabbitrabbit

RabbitRabbit Form

"Rabbit and Rabbit! Build up! Are you ready? Overflow! (Techno pop music) Kurenai no speedy jumper! RabbitRabbit! Yabei! Haei![8]"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 106.2 kg

Ability Parameters:

  • Punching Power: 39.9 tons
  • Kicking Power: 47.8 tons
  • Jump Height
    • Base Jump Height: 88.0 m
    • Max Jump Height: 132.0 m
  • Running Speed
    • Base Running Speed: 100 m. per 1.2 sec.
    • Maximum Running Speed: 100 m. per 0.8 sec.

RabbitRabbit Form (ラビットラビットフォーム Rabitto Rabitto Fōmu) is one of Build's upgraded super forms, based on the Rabbit Halfbody. It is accessed by upgrading RabbitTank Hazard Form with the FullFull RabbitTank Bottle, set to its Rabbit mode, hence known as the Crimson Speedy Jumper (紅のスピーディージャンパー Kurenai no Supīdī Janpā).

In this form, Build can not only run faster, and jump higher than he could in RabbitTank Sparkling form, but he can also stretch his limbs at will. Strengthening materials inside the chest piece of RabbitRabbit allow the user to increase its reaction time, jumping height, running speed up to a maximum of 1.5x.

In RabbitRabbit Form, Build is armed with and protected by the Rapid Rabbit Shoulders (BLDラピッドラビットショルダー BLD Rapiddo Rabitto Shorudā), the Speed Chest Armor (スピーディーチェストアーマー Supīdī Chesuto Āmā), the arm-mounted Hop Pop Gauntlets (ホップポップガントレット Hoppu Poppu Gantoretto) and the leg-mounted Jump Champ Leggers (ジャンプチャンプレガース Janpu Chanpu Regāsu).

The Hop Pop Gauntlets and Jump Champ Leggers contain Dimension Springers (ディメンションスプリンガー Dimenshon Supuringā) that enable long distance stretching.

On the back of RabbitRabbit Form is the cape-like Mufflerabbit Accelerator (マフラビットアクセラレーター Mafura Bitto Akuserarētā), which enables Build to run around at supersonic speeds thanks to an inbuilt propulsion accelerating device.

  • Build Driver finisher:
    • RabbitRabbit Finish (ラビットラビットフィニッシュ Rabitto Rabitto Finisshu): Jumping into the air, Build stretches his leg towards the opponent, and pulling his body towards his foot, connects with the target, with the resulting impact sending his opponent flying.
  • Fullbottle Buster finisher:
    • Fullbottle Break (フルボトルブレイク Furubotoru Bureiku): Build channels the power of a single Fullbottle for either a powerful slash or a powerful shot.
      • Rabbit: Build fires a ball of red energy at the enemy.
    • Just Match Break (ジャストマッチブレイク Jasuto Matchi Bureiku): Build channels the power of two Fullbottle for either a powerful slash or a powerful shot.
    • Miracle Match Break (ミラクルマッチブレイク Mirakuru Matchi Bureiku): Build channels the power of three Fullbottle for either a powerful slash or a powerful shot.
      • Rabbit + Panda + Taka: Build fires a ball of red and white energy mixed together that gives off orange energy shockwaves upon impact.
    • Ultimate Match Break (アルティメットマッチブレイク Arutimetto Macchi Bureiku): Build channels the power of four Fullbottle for either a powerful slash or a powerful shot.
    • FullFull Match Break (フルフルマッチブレイク Furu Furu Matchi Bureiku): Build channels the power of the FullFull RabbitTank Bottle for either a powerful slash or a powerful shot.
      • Rabbit Mode: Build runs at the enemy at high speeds, and delivers a slash with the blade covered in red energy.

Appearances: Build Episodes 27-36, 38-40, Be The One

TankTank Form
KRBu-Buildtanktank

TankTank Form

"Tank and Tank! Build up! Are you ready? Overflow! (Techno rock music) Koutetsu no blue warrior! TankTank! Yabei! Tuei![8]"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 197.5 cm
  • Rider Weight: 145.3 kg

Ability Parameters:

  • Punching Power
    • Base Punching Power: 47.0 tons
    • Maximum Punching Power: 70.5 tons
  • Kicking Power
    • Base Kicking Power: 53.7 tons
    • Maximum Kicking Power: 80.55 tons
  • Maximum Jump Height: 58.0 m
  • Maximum Running Speed: 100 m. per 1.1 sec.

TankTank Form (タンクタンクフォーム Tanku Tanku Fōmu) is one of Build's upgraded super forms, based on the Tank Halfbody. It is accessed by upgrading RabbitTank Hazard Form with the FullFull RabbitTank Bottle, set to its Tank mode, hence known as the Blue Warrior of Steel (鋼鉄のブルーウォーリアー Kōtetsu no Burū Wōriā).

In this form, Build's armor becomes significantly denser and is covered in tank treads and turrets to boost his attacks and defenses. Strengthening materials inside the chest piece of TankTank allow the user to increase its punching and kicking power up to a maximum of 1.5x.

In TankTank Form, Build is armed with and protected by the BLD TankTank Shoulders (BLDタンクタンクショルダー BLD Tanku Tanku Shorudā), the Warrior Chest Armor (ウォーリアチェストアーマー Wōriā Chesuto Āmā), the arm-mounted Fight Might Gauntlets (ファイトマイトガントレット Faito Maito Gantoretto) and the leg-mounted Dash Mash Leggers (ダッシュマッシュレガース Dasshu Masshu Regāsu).

The Fight Might Gauntlets and Dash Mash Leggers contain Blue Tank Rollers (ブルータンクローラー Burū Tanku Rōrā), which are the tank tread-like units on the forearms and shins, and enable high-speed cutting power.

  • Build Dri