Takeshi Asakura

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.

History
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 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.

Ouja is later 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.

Asakura later appears to fight the organization, Dai-Shocker. 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.

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.

Personality
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".

Forms
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. 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. This form is acquired when Ouja stole the Survive Shippu card from Kamen Rider Knight, becoming more powerful than his other forms. 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).
 * -|Default= Default
 * Rider Height: 200cm
 * Rider Weight: 98kg
 * Ability Perimeters:Ouja.png
 * Punching Power: 12.5 tons
 * Kicking Power: 20 tons
 * Max Jump Height: 40m
 * Maximum Running Speed: 100m/5s
 * -|Survive Form= Survive Form
 * Rider Height: 198cm
 * Rider Weight: 97kg
 * Ability Perimeters:OujaSurvive.png
 * Punching Power: 17.5 tons
 * Kicking Power: 27.5 tons
 * Maximum Jump Height: 60m
 * Maximum running speed: 100m/3s

Trivia

 * 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.