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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 law of victory is set!"
―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]

"Best Match kita!"
―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]

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. He is a man with no memory of his past, and fights to find the truth about himself. Initially believed to be someone named Taro Satou (佐藤 太郎 Satō Tarō), his true identity turned out to be someone else.

History

Early Life

Main article: Takumi Katsuragi
Takumi Katsuragi (Build)

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

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.

Katsuragi eventually had a change of heart and decided to quit Faust. Soichi Isurugi confronted him as Blood Stalk, only for Katsuragi to reply that he had hidden his research data to expose the group. As Stalk knocked out Katsuragi, a man named Taro Satou arrived at Katsuragi's home to apply for a drug-testing job, 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, Katsuragi had his memory wiped by Stalk, and was injected with Nebula Gas.

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 Banjou, 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[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 Bi-Kaiser 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.

The night before the duel, Sento had given Misora the kill switch and asked her to use it despite her pleas.

More to come...

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?). After transforming, he says "The law of victory is set." (勝利の法則は決まった Shōri no hōsoku wa kimatta).

Powers and Abilities

  • Hazard Level 4 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 is now 4.4 according to Blood Stalk.
  • 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.
    • 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 him to be a capable strategist, being able to outwit even Blood Stalk on two occasions and even Namba.
  • Fullbottle Augmentation: By using 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 Banjou in a one-on-one fight.
    • Gorilla: Allows Sento to perform fiery punches. First used to fight Ryuga Banjou.
  • Fourth Wall Interaction: Used only for comical purposes, Sento is capable of interacting with Ryuga's recollection of his birth in various ways. Normally involving 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.
    • Dragon Jelly: Sento is incapable of using this item as it sends painful electric shocks through his body after being inserted into the Sclash Driver. Later, it was revealed that Sento's Hazard level was lacking as the minimum Hazard Level to use the Sclash Driver is a 4.0.
  • Hazard Trigger: (Previously) 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 later overcomes these effects by using the FullFull RabbitTank Bottle.
  • Hazard Kill Switch: (Previously) 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 is no longer needed.
  • 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).

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).

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, and can summon the Drill Crusher.

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 Perimeters:

  • 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 considered to be the most well balanced; having a good amount of power and agility in all of his Ability Perimeters, thus making it Build's default form, despite it being capable of initiating transformation with any set 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

RabbitSoujiki Form
KRBu-Buildrabbitsoujiki

RabbitSoujiki Form

"Rabbit! Soujiki! Are you Ready?"
―RabbitSoujiki's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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 Perimeters 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).

Appearances: Build Episode 2

RabbitGatling Form
KRBu-Buildrabbitgatling

RabbitGatling Form

"Rabbit! Gatling! Are you Ready?"
―RabbitGatling's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 4

Trial Forms
"Rabbit! (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 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 Perimeters:

  • 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, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders[1]

GorillaSoujiki Form
KRBu-Buildgorillasoujiki

GorillaSoujiki Form

"Gorilla! Soujiki! Are you Ready?"
―GorillaSoujiki's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 3

GorillaRocket Form
KRBu-Buildgorillarocket

GorillaRocket Form

"Gorilla! Rocket! Are you Ready?"
―GorillaRocket's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: 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? (Techno Rock music) Tenkuu no Abarenbou! HawkGatling! Yeahhh!"
―HawkGatling's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―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? (Techno Shinobi music) Shinobi no Entertainer! NinninComic! Yeahhh!"
―NinninComic's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―NinjyaTank's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 6

Trial Forms
"Ninjya! (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 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? (Monotone Classical music) Buttobi Monotone! RocketPanda! Yeahhh!"
―RocketPanda's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―PandaGatling's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 7

Trial Forms
"Panda! (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 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? (Techno Pop music) Rescue Kenzan! FireHedgehog! Yeahhh!"
―FireHedgehog's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―HarinezumiTank's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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 Perimeters 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?"
―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? (Upbeat Techno Pop music) Tategami Cyclone! LionCleaner! Yeah!"
―LionCleaner's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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 perimeters. 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?"
―LionComic's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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)

Appearances: Build Episode 15

Trial Forms
"Lion! (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 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? (Classical 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 Perimeters:

  • 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?"
―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? (Classical Rock music) Teikoku no Hangyakusha! KaizokuRessya! Yeahhh!"
―KaizokuRessya's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―KaizokuGatling's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 16

Trial Forms
"Kaizoku! (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. 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? (Upbeat Techno Rock music) Inazuma Technician! OctopusLight! Yeahhh!"
―OctopusLight's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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 perimeters. 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?"
―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? (Classical Rock music) Fujimi no Heiki! PhoenixRobo! Yeahhh!"
―PhoenixRobo's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―PhoenixSoujiki's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―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? (Surfer music) Tsunagaru Ippiki Ookami! SmaphoWolf! Yeahhh!"
―SmaphoWolf's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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?"
―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 Perimeters:

  • 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?"
―RoseSoujiki's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 21

RoseSyoubousya Form
KRBu-Buildrosesyoubousya

RoseSyoubousya Form

"Rose! Syoubousya! Are you Ready?"
―RoseSyoubousya's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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).

Appearances: Build Episode 25

Trial Forms
"Rose! (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 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? (Tropically Rock music) Mikakunin Jungle Hunter! ToraUFO! Yeahhh!"
―ToraUFO's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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 perimeters 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?"
―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? (Surfer Rock music) Amakakeru Big Wave! KujiraJet! Yeahhh!"
―KujiraJet's transformation announcement[src]

Rider Statistics

  • Rider Height:
  • Rider Weight:

Ability Perimeters:

  • Punching Power:
  • Kicking Power:
  • Maximum Jump Height:
  • Maximum Running Speed:

KujiraJet Form (クジラジェットフォーム Kujira Jetto Fōmu) is Build's navy and teal 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?"
―KujiraSyoubousya's transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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.

Appearances: Build Episode 25

Trial Forms
"Kujira! (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 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]

Rider Statistics

  • Rider Height:
  • Rider Weight:

Ability Perimeters:

  • Punching Power:
  • Kicking Power:
  • Maximum Jump Height:
  • Maximum Running Speed:

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?"
―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? (Soda Can opening to Technical 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 Perimeters:

  • 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 perimeters, 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? (Oven's ding to Technical 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.

RabbitTank Hazard Form
KRBu-Buildrabbittankhazard

RabbitTank Hazard Form

Rider Statistics

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

Ability Perimeters:

  • 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

Ability Perimeters:

  • Punching Power:
  • Kicking Power:
  • Maximum Jump Height:
  • Maximum Running Speed:

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 Perimeters:

  • 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 Perimeters:

  • 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):

This form is exclusive to Episode 24

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! Kurenai no Speedy Jumper! RabbitRabbit! Yabei! Haeeeeei![8]"
―Transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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:
    • Hazard Finish: RabbitRabbit Finish (ハザードフィニッシュ: ラビットラビットフィニッシュ Hazādo Finisshu: 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 27-32

TankTank Form
KRBu-Buildtanktank

TankTank Form

"Tank and Tank! Build Up! Are you Ready? Overflow! Koutetsu no Blue Warrior! TankTank! Yabei! Tueeeeei![8]"
―Transformation announcement[src]

Rider Statistics

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

Ability Perimeters:

  • 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<