Takeshi Asakura

History
Arrested for murdering his entire family, save his kid brother, in a fire he caused at age 13, Asakura made a name for himself 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, Asakura was personally responsible for both ending the piano career of 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. Wanting to bust out and express his destructive impulses on Kitoaka, Asakura gladly accepted Kanzaki's offer to join the Rider War and forms a pact with Venosnaker to become Kamen Rider Ohja.

Taking full advantage of the Rider War, wanting to win just to start it up again for his amusement, Asakura learns of Kitaoka's identity as Kamen Rider Zolda and holds his assistant Goro Yura hostage. Though Goro escapes, Ohja gets to fights Zolda and his reinforcements before senselessly killing Kamen Rider Gai, who set the event up, and later claimed his Contact Monster Metalgelas as his own. He later does the same to Miyuki Tezuka, a friend of Yuichi's who became Kamen Rider Raia to end the Rider War, and obtained his Contact Monster Evildiver afterwards. Eventually with help from Ren, Kamen Rider Knight, Takeshi fakes his death so he can participate in the Ride War without police interference. But once publicly revealed to be alive, Asakura was soon later captured, going in and out of jail for several instances. As the Rider War begins to reach its climax, destroying Kamen Rider Imperer's deck so he can fade away in the Mirror World, Asakura engages Zolda in a final showdown. Though he believe him to be Kitaoka, his fatally wounded opponent was actually Goro who took the deceased Kitaoka's place. Denied the chance to kill Kitaoka as he resturns to the real world, Asakura finds himself surrounded by the authorities and the taken out by snipers as he went down fighting.

Episode Final ending
In an alternate retelling of the Rider War's final days, Asakura finds himself facing Miho Kirishima, who became Kamen Rider Femme to hunt him down to avenge her sister. Ohja overpowered Femme until the appearance of Kamen Rider Ryuga destroyed Genocider. This causes Ouja to revert to a weak Blank Form with Feme destroying his deck. Defeated as his armor disintegrated, Asakura's body dissolved as he attempted to strangle Miho to death.