Takeshi Asakura/World of If

In an alternate ending, World of If, Takeshi Asakura (浅倉 威) is one of the participants of the Rider Fight known as Kamen Rider Ouja (仮面ライダー王蛇).

World of If
In this S.I.C. alternate retelling of the story, the remaining Riders are Ryuki (now Ryuga), Knight, Tiger, Ouja and Odin. Meanwhile, when Knight and Ouja are fighting, Ren's cellphone rings. The doctor says that Eri's condition is deteriorating fast, and heads off to the hospital, abandoning the fight and dropping his Survive card. With the Survive Shippu card in his hand, Ouja, as the final Rider, stands before Odin. His wish is for the Rider War to continue for all eternity. In the middle of the battle, Alternative Zero jumps in and joins forces with Ouja in order to fight Odin. Ouja activates his Final Vent; Venoviper transforms into a bike and charges at Odin, spitting poison along the way. A moment before it hits him, though, Odin activates his Time Vent and vanishes, then reappears on Venoviper's seat and strikes him quickly.

Right before he dies, Asakura sees Odin's face, through the hole in his helmet melted by Venoviper's poison, revealing Ren's face.

Forms
Ouja Rider Statistics Rider Senses: Ability Parameters: Special Attacks:
 * Rider Height: 200 cm.
 * Rider Weight: 98 kg.
 * Eyesight: 15 km.
 * Hearing: 15 km.
 * Punching Power: 250 AP (12.5 t.)
 * Kicking Power: 400 AP (20 t.)
 * Maximum Jump Height: 40 m.
 * Maximum Running Speed: 100 m. per 5 sec.
 * Veno Saber: 3000 AP (150 t.)
 * Metal Horn: 2000 AP (100 t.)
 * Evil Whip: 2000 AP (100 t.)
 * Veno Crash: 6000 AP (300 t.)
 * Hide Venom: 5000 AP (250 t.)
 * Heavy Pressure: 5000 AP (250 t.)
 * Doomsday: 8000 AP (400 t.)
 * Advent: Venosnaker: 5000 AP (250 t.)
 * Advent: Metalgelas: 4000 AP (200 t.)
 * Advent: Evildiver: 4000 AP (200 t.)
 * Advent: Genocider: 7000 AP (350 t.)

Asekura can transform into Kamen Rider Ouja using his Advent Deck and V-Buckle upon forming a contract with Venosnaker. His Visor is a scepter named the Veno Visor (ベノバイザー). Ouja's kicking power and running speed are identical to Ryuki's, while his jump punching power and jump height are slightly higher.

Through the use of his Sword Vent Advent Card, Ouja can arm himself with the Veno Saber (ベノサーベル), a sword derived from Venosnaker's tail.

Asakura later forms additional contracts with Evildiver and Metalgelas after the Riders they were previously contracted to, Raia and Gai, are killed. This enables to to use all of Raia and Gai's Advent Cards. Thus, he is able to arm himself with Raia's Evil Whip (エビルウィップ), a whip derived from Evildiver's tail, and Gai's Metal Horn (メタルホーン), a gauntlet derived from Metalgelas' head. Ouja is also able to perform the Riders' respective finishers.

By using Venosnaker's Final Vent, Ouja can execute his primary finisher, the Veno Crash (ベノクラッシュ), in which Ouja runs toward the opponent with Venosnaker slithering behind him before jumping into the air. Venosnaker then spits a stream of venom at Ouja, propelling him into a flying bicycle kick that strikes the enemy. By using Evildiver's Final Vent, Ouja can execute Raia's finisher, Hide Venom (ハイドベノン), in which he rides on Evildiver's back and rams into the enemy. By using Metalgelas' Final Vent, Ouja can execute Gai's finisher, Heavy Pressure (ヘビープレッシャー), which equips him with the Metal Horn if he does not already possess it. Ouja next grabs onto Metalgelas' head with his legs and points the Metal Horn in front of him. Metalgelas then runs into the enemy, resulting in Ouja striking it with the Metal Horn.

By using the Unite Vent Advent Card, Ouja can combine Venosnaker, Evildiver, and Metalgelas into Genocider. This grants Ouja another Final Vent, which Ouja uses to perform his strongest finisher, Doomsday: A hole leading to a void opens on Genociders's chest, creating a vortex that begins sucking surrounding objects into it. Ouja then delivers a corkscrew kick to the opponent, pushing them into the vortex and thus into the void, completing destroying the enemy.

Contract Monsters

 * Venosnaker

Equipment

 * Advent Deck - Transformation device and Advent Card holder
 * V-Buckle - Transformation belt
 * Advent Cards - Trinkets that enable a Rider to summon Contract Monsters, access equipment, and use special abilities
 * Veno Visor - Ouja's Visor that enables him to use Advent Cards

Vehicles

 * Ride Shooter - Motorcycle used by any Rider to enter the Mirror World