This article is about a/an rider in Kamen Rider Ryuki.
Takeshi Asakura


Asakura Ex-Aid

Kamen Rider Ouja
Gender: Male
Series: Kamen Rider Ryuki
Motif: King Cobra (Snake)
Rider Type: Villain (Current)
Hero (Kamen Rider Hyper Video: Kamen Rider Ryuki Vs. Kamen Rider Agito, OOO, Den-O, All Riders: Let's Go Kamen Riders, Live and show)
Homeworld: Earth
First Appearance: The Grieving Knight
Last Appearance: Kamen Rider Brave ~Let's Survive! Revival of the Beast Rider Squad!~
Number of Episode
33 (Ryuki)
1 (Decade)
3 (Movies)
3 (Special)
Full list of appearances
Actor: Takashi Hagino

Takeshi Asakura (浅倉 威 Asakura Takeshi) is Kamen Rider Ouja (仮面ライダー王蛇 Kamen Raidā Ōja, lit. "King Snake"), a Rider in the Kamen Rider Series Kamen Rider Ryuki. He is the sixth of the 13 Kamen Riders the story revolves around and serves as one of the main villains in the series.



Asakura was born in 1977. At age 13, he murdered his entire family in a fire, though his younger brother survived. Since, Asakura developed a reputation as a sadistic felon with a love to fight, maim and otherwise destroy anything in his random fits of rage. As a result of his sadistic nature, prior to becoming a Rider, Asakura was personally responsible for both ending the piano career of Tezuka's friend Yuichi Saito and murdering the older sister of Miho Kirishima. Eventually, his arrogant personality results with his defense attorney, Shuichi Kitaoka refusing to represent him and left him to rot in jail. Because he was in prison and could not feed his destructive nature, Takeshi gladly accepted Kanzaki's offer to join the Rider War and forms a pact with Venosnaker, using his newfound powers as Ouja in its many forms to break out of jail, avoid the law, and get his revenge on Kitaoka.


Ouja and his Mirror Monsters.

Ouja fought only to fight and was the first Rider to actually kill other Riders, killing Kamen Rider Gai and Kamen Rider Raia and taking their Contract Monster afterwards. Ouja also destroyed Kamen Rider Imperer's deck, causing him to die in the Mirror World. While the other Riders had a desire that would be granted if they won the Rider War, Asakura was simply having fun, and said that if he won, he would wish for the Rider War to start over so he could keep enjoying himself.

Ren helped Asakura fake his death once so he can fight in the Rider War without police interference. But when he was publicly revealed to be alive, Asakura was soon later captured, going in and out of jail for several instances. In one such case, he uses Metalgelas while in a police van to dispose of his police captors before escaping into the Mirror World. After a fight with Kamen Rider Survive Ryuki and Kamen Rider Tiger, he had been seriously injured and handed back to the authorities once again by Shinji. Soon he escaped again, with aid of his lawyer at that time whom he had knocked out and switched clothes with the lawyer to escape.

In the process of learning of Kitaoka's identity as a Rider, Asakura attempted to lure him by staging a hostage situation to get Kitaoka. Asakura had Venosnaker kidnap Goro Yura so Ouja can pressure Zolda into bringing Knight, Ryuki and Raia to a specific meeting place. However, Goro escapes by picking the lock of the handcuffs. Though he lost to Zolda, Ouja survived and senselessly killed Kamen Rider Gai in the process.

Upon learning of Kitaoka's identity as a Rider, he formed a personal grudge against him that manifested in many attempts to harm Kitaoka. The two would fight many times throughout the series. Miyuki Tezuka (Kamen Rider Raia) also held a personal grudge against Asakura for ending the piano career of his friend, Yuichi Saito.

During the series, he came under fire from his three monsters when they were hungry for life energy. They came close to devouring Asakura if not for his strong determination. After hunting down three Mirror Monsters, Ouja was able to feed his contract monsters. Kamen Rider Knight and Zolda tried to prevent his monsters from feeding so that they would turn on him and remove Asakura from the Rider War. but Kamen Rider Ryuki intervened and allowed the monsters to feed because Asakura had actually saved a small girl from the three monsters they hunted.

At the end of the series he finally has his showdown with Zolda. Ouja, using his "Doomsday" Final Vent, destroys Magnugiga before fatally injuring Zolda. Though happy with his victory, Ouja finds out seconds later that "Zolda" was actually Goro, as Kitaoka gave him his vent deck prior to succumbing to his cancer during the fight. Just as he returned to the real world in utter disarray of being denied the right to kill the man he hated the most, Asakura finds himself surrounded by the authorities in the warehouse he was in with snipers covering them. Defiant to the end, Asakura grabs a metal rod and runs at the cops screaming as they gun him down, brought to justice at last.

But because Kanzaki restored time to its proper course after Yui's death, Asakura was given a second chance in life with no memory of being a Rider and keeping a low profile, but still having a rude personality, as he was kicking Shinji's bike because it was in the way.

13 Riders

In the 13 Riders Special, Asakura was already a Rider and in jail until Venosnaker busted its master out. He later kills Kamen Rider Scissors. He reappears at the end where he activates Final Vent together with the others in one ending.

Kamen Rider Ryuki: Episode Final

Ouja (Episode Final)

Ouja in Episode Final

Ouja's End

Ouja's death

In the movie, Episode Final, Asakura was targeted by Miho Kirishima, who became Kamen Rider Femme to hunt him down for revenge. Though she was outmatched by the stronger opponent, Kamen Rider Ryuga's destroying of Genocider reverted Ouja to Blank Form. Weakened, Femme stabbed right at Ouja's blank deck, destroying it. Shortly, Ouja's armor disintegrated and Asakura dissolved in the Mirror World as he attempted to take Miho down with him.

Kamen Rider Decade


Ouja in the World of Hibiki.

In Kamen Rider Decade, Ouja is summoned in the World of Hibiki by Kiva-la, wielding a kanabō which he uses to summon a Bakegani from the mountain side after knocking Kiva-la aside.

Kamen Rider Decade: All Riders vs. Dai-Shocker

Asakura later appears in All Riders VS Dai-Shocker to fight the organization. However due to his sadistic nature he sides with Dai-Shocker along with KickHopper (Yaguruma). He attempts to stop Diend and Natsumi only for Diend to summon Gai, Raia, and PunchHopper to fight him and Yaguruma. He fought Gai and Raia, the two riders he killed in the series. The outcome of the fight is unknown.

OOO, Den-O, All Riders: Let's Go Kamen Riders

Kamen Rider Ouja in Legend War

Kamen Rider Ouja was part of a group of reinforcement riders led by Akira Date/Kamen Rider Birth to aid the primary riders in defeating the Rock Great Leader. All the Kamen Riders got on their bikes and performed the All Rider Break attack which destroyed the Great Leader. OOO, Den-O, All Riders: Let's Go Kamen Riders

D-Video Special: Kamen Rider 4


Due to the re-alterations of time made by Shocker, Ouja later appeared, along with Kamen Riders 4, Sasword, Dark Kiva, and Baron to fight against the Kamen Riders as they catch onto Shocker's latest schemes. During the final loop, Ouja is destroyed alongside Dark Kiva by Deadheat Mach's Hit Macher Full Throttle. Duel! The True Identity of Shocker's Great Leader

Kamen Rider Ghost Special Event


Kamen Rider Ex-Aid

Beast Rider Squad 2017
"Fight! Keep fighting! If you don't will die..."
―Asakura's last words before fading away once again[src]

Asakura was later revived along with the Beast Rider Squad as part of Foundation X's scheme in researching the Rider Gashats. He attacks Hiiro Kagami's nurse assistants, Mizuki and Satsuki, as well as Emu Hojo. Asakura as Ouja would later be defeated by Brave's Level 4 form, leading to Asakura fading away once again. Kamen Rider Brave: ~Let's Survive! Revival of the Beast Rider Squad!~


Asakura is a violent and sadistic man, finding joy in fighting, maiming, killing, or otherwise destroying anything in his random fits of rage. He has no sympathy or remorse for his actions, and will attack anyone simply because he was "vexed". He also didn't seem to even care when taking other user's contract monsters.

Fighting Style

Ouja is a melee based Rider like majority of the Kamen Riders. However, he is extremely sadistic, showing no mercy as well as superior tactics over his opponents. He fights relentlessly, but only if he is sure he will win, and isn't hesitant to use other Riders as factors or pawns in his battles. His Sword Vent is his most frequently used weapon. He becomes even more powerful when he forms Contracts with Metalgelas and Evildiver. This allows him access to Gai's Strike Vent and Raia's Swing Vent, making him a more versatile as well as a more deadly force. His Contract Monster Venosnaker participates in his battles, and is often seen as Dragreder's evil equivalent in the series (this has been replaced by Dragblacker).

However, Ouja is not without weaknesses. He's more vulnerable towards long-ranged opponents, his own unstable nature outclasses his fighting potential, he rarely uses his special card Steal Vent (possibly because he is comfortable with his choice of weapon, as well as only using it to disarm Riders, which is an ineffective strategy), and he rarely takes advantage of the more powerful Genocider, using the united Contract Monster as a more menacing or intimidating distraction in the battlefield. This may also prove that the united Contract Monster is difficult to control, but is restrainable.


Blank Form
Ouja Blank (720p)

Blank Form



Blank Form (ブランク体 Buranku-tai) is Ouja's default form when his Mirror Monsters are destroyed. It's much weaker than any other form and any of the other Riders, though it's enough to keep him from disintegrating in the Mirror World.

Ouja's Blank Form is the only form among the 13 Kamen Riders seen in the show, movie, and special, not to appear in the Kamen Rider Ryuki video game.

Appearances: Episode Final


Kamen Rider Ouja

  • Height: 200cm
  • Weight: 98kg

Ability Perimeters

  • Sight & Hearing: 15km
  • Maximum Running Speed: 100m/5s
  • Maximum Jump Height: 40m
  • Punching Power: 12.5t (AP:250)
  • Kicking Power: 20t (AP:400)

This is Ouja's standard form that he had throughout most of the series, obtained once he forms his contract with Venosnaker. A melee-based Rider, Ouja's fighting style helped him in his victories more often than any of his Advent cards, using the Veno Visor (ベノバイザー Beno Baizā) scepter to conjure his spiral-bladed Veno Saber. His Final Vent is Veno Crash (ベノクラッシュ Beno Kurasshu), running at an opponent with Venosnaker slithering behind before raising its head up as its master jumps back towards it and the Mirror Monster launches him so he can deliver a rapid bicycle kick at the target. Once he defeated Gai and Raia, he had access to both their contract monsters and their Advent cards, becoming an even more dangerous force to be reckoned with the Unite Vent to create Genocider so the Final Vent Doomsday is used, with Ouja corkscrew kicking his opponent into a vortex that materialized on Genocider's torso.

Appearances: Ryuki Episodes 18-28, 31-32, 34-36, 40-41, 43-45, 50, Episode Final, 13 Riders, Ryuki vs Kamen Rider Agito, Brave: ~Let's Survive! Revival of the Beast Rider Squad!~

Ouja Survive
Ouja Survive

Ouja Survive

  • Height: 198cm
  • Weight: 97kg

Ability Perimeters

  • Punching Power: 17.5t (AP:350)
  • Kicking Power: 27.5t (AP:550)
  • Maximum Jump Height: 60m

Kamen Rider Ouja Survive (仮面ライダー王蛇サバイブ Kamen Raidā Ōja Sabaibu) is Ouja's ultimate form, which only appeared in the first Ryuki's S.I.C. Hero Saga story in Monthly Hobby Japan magazine, Kamen Rider Ryuki: Advent Calendar (MASKED RIDER RYUKI -アドベントカレンダー- Kamen Raidā Ryūki: Adobento Karendā). This form is acquired when Ouja stole the Survive Shippu card from Kamen Rider Knight, becoming more powerful than his other forms. From the magazine, his contract monster Venosnaker, is also able to change into a more powerful version, Venoviper (ベノバイパー Benobaipā), and combine it with other stolen contract monsters to form Genosurviver (ジェノサバイバー Jenosabaibā).

Contract Monsters

Main article: Venosnaker
Main article: Genocider

Advent Cards

Kamen Rider Ouja had the most Advent Cards out of any of the Riders. This was because he obtained two extra decks of cards by contracting with two of the Mirror world monsters that were previously contracted with Riders he defeated.





Rider Cards

Kamen Ride Ouja

KamenRide: Ouja

Behind the scenes


Takeshi Asakura is portrayed by Takashi Hagino (萩野 崇 Hagino Takashi). As Kamen Rider Ouja, his suit actor was Jiro Okamoto (岡元 次郎 Okamoto Jirō), his sub was Keizo Yabe (矢部 敬三 Yabe Keizō).


  • Ouja's name is variably written as "Oja", "Ohja", and "Ohjya" in media released by TV Asahi, Toei Company, and Bandai.
    • His Rider name, Ouja, could also literally meant "King Evil" (王邪 Ōja), as he is the long standing evil Kamen Rider in this series.
  • Asakura translates to 'Morning Storehouse.' It is the name of a former village, a city, and a district in Japan, as well as that of a daimyō clan.
  • He shares his first name with Takeshi Hongo/Kamen Rider 1, the first Kamen Rider.


  • Kamen Rider Ouja is also based on the Shocker monster, Cobra Man where both individuals share a dominant purple color.
    • Ouja's Contract Monster, Venosnaker also shared this motif to the point where it can also spit dangerous venoms like the said Shocker monster.
    • A homage to Ouja appears in Kamen Rider Den-O in the form of the Cobra Imagin, who not only shares Ouja's cobra motif but is also voiced by Ouja's actor, Takashi Hagino. As pointed out in the design book Imagin: Say Your Wish..., the Cobra Imagin is designed to resemble Ouja.
  • Gen Urobuchi, the head writer of Kamen Rider Gaim, used Ouja to describe Takatora Kureshima (Kamen Rider Zangetsu), referring to him as 'the Ouja' of the series.
  • The kanabo used by Kamen Rider Ouja in Kamen Rider Decade is similar to the one used by Tohki.
  • Just like the other Kamen Riders, he died an ironic death: He killed the most Riders in the war, but never the ones he wanted to kill the most: Shinji, Tojo and Kitaoka. He originally entered the war to kill Kitaoka, but when he finally, technically achieved his goal by killing Zolda (who was, in truth, Goro Yura), he went mad with dissatisfaction and was himself killed.
  • He has the most deaths for his series, he was killed by the authorities after losing his cool, was impaled by Femme, was killed by deadheat mech and killed by Brave's level 4 form.
  • Ironically enough, the number of people he killed is the same exact number of times he was killed.
  • Strangely, Ouja's Blank Form does not lose the Snake motifs as Ryuki's loses his Dragon motifs upon reverting to Blank Form. Ouja's Blank Form instead is his standard form desaturated to gray tones.

See Also

Pryce & James Trademore - Takeshi's American counterparts in Kamen Rider Dragon Knight.


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