|Name: Takeshi Asakura|
|Designation: Kamen Rider Ohja|
|Weapons: Veno Saber, Veno Visor|
|Advent Cards: Sword Vent, Venosnaker, Strike Vent, Swing Vent, Steal Vent, Unite Vent, Final Vent|
|Contract Beast: Venosnaker, Metalgelas, Evildiver, Genosider|
|Takeshi was a psychotic serial killer who had many enemies and an enormous chip on his shoulder. At age 13, Takeshi 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 the piano career of Tezuka's friend Yuichi Saito and murdering the older sister of Miho/Femme. Eventually, his arrogant personality results with his defense attorney, Kitaoka/Zolda 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 new found powers as Ohja in its many forms to break out of jail, avoid the law, and get his revenge on Kitaoka.
Ohja fought only to fight and was the first Rider to actually kill other Riders, killing Gai and Raia and taking their Contract Monster afterwards. Ohja also destroyed Imperer, causing him to die in the Mirror World. 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 Ryuki and 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.
At the end of the series, Asakura finally has his showdown with Zolda. Ohja, using his "Doomsday" Final Vent, destroys Magnugiga before fatally injuring Zolda. Though happy with his victory, Ohja finds out seconds later that "Zolda" was actually Goro, as Kitaoka gave him his deck prior to succumbing to his cancer. Just as he returned to the real world in utter disarray of being denied the right to kill the man he hated, Asakura finds himself surrounded by police 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. 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.
In the movie, Episode Final, Asakura was targeted by Miho/Femme and though she was outmatched by the stronger opponent, she was saved by Ryuga who used Dragblacker to knock down Genocider. The destruction of Genocider rby Ryuga everted Ohja to Blank Form. Weakened, Femme stabbed right at Ohja's blank deck, destroying it. Shortly, Ohja's armor disintegrated and Asakura dissolved into the Mirror World as he attempted to take Miho down with him. In the 13 Riders Special, Asakura was already a Rider and in jail until Venosnaker busted its master out. He later kills Scissors. He reappears at the end where he activates Final Vent together with the others in one ending.
He uses the Veno Visor scepter to conjure his spiral-bladed Veno Saber. His final Vent is Veno Crash, running at an opponent with Venosnaker slithering behind before raising its head up as is master jumps back towards it and the Miror Monster launches him so he can deliver a rapid bicycle Rider Kick at the target. Once defeating Gai and Raia, he had access to both their contract monsters and creates Genocider so the Final Vent Doomsday is used, with Ohja corkscrew kicking his opponent into a vortex that materialized on Genocider's torso.