Profile
- Rider : Kamen Rider Ouja
- Host : Takeshi Asakura
- Gender : Male
- Series : Kamen Rider Ryuki
- Motif : King Cobra, Pharaoh
- 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 : OOO, Den-O, All Riders: Let's Go Kamen Riders
- Appearances : 33 (Ryuki), 1 (Decade), 3 (Movies), 1 (Special)
- Actor : Takashi Hagino
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Venosnaker participates in his battles, and is often seen as Dragreder's evil equivalent in the series (this has been replaced by Dragblacker).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.
Forms
Blank Form
Blank Form 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. First shown in Kamen Rider Ryuki: Episode Final. 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
Ouja Form
- Height : 200cm
- Weight : 98kg
- Sight & Hearing : 15km
- Maximum Running Speed : 100m/5s
- Maximum Jump Height : 40m
- Punching Power : 12.5t (AP:250)
- Kicking Power : 20t (AP:400)
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.
Survive Form
- Height : 198cm
- Weight : 97kg
- Punching Power : 17.5t (AP:350)
- Kicking Power : 27.5t (AP:550)
- Maximum Jump Height : 60m
Contract Monsters
- Venosnaker
- Genocider
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.
Venosnaker-Based:
- Advent (AP : 5000) : Summons Venosnaker.
- Sword Vent (AP : 3000): Conjures Veno Saber.
- Steal Vent : Steals a target Rider's weapon.
- Final Vent (AP : 6000) : Executes Veno Crash. Venosnaker launches Ouja at the opponent where Ouja performs a devastating bicycle kick on the opponent.
- Advent (AP : 4000) : Summons Metalgelas.
- Strike Vent (AP : 2000) : Conjures Metal Horn.
- Final Vent (AP : 5000) : Executes Heavy Pressure. Ouja rides on Metalgelas with the Metal Horn extended in front of him to pierce through the opponent.
- Advent (AP : 4000) : Summons Evildiver.
- Swing Vent (AP : 2000) : Conjures Evil Whip.
- Final Vent (AP : 5000) : Executes Hide Venom. Ouja rides on Evildiver's back and rams the enemy.
- Advent : Summons Genocider.
- Unite Vent : Combines Venosnaker, Metalgelas, and Evildiver into Genocider.
- Final Vent (AP : 8000) : Executes Doomsday. Ouja corkscrew kicks his opponent into a vortex that materializes on Genocider's torso.
- Kamen Ride : Ouja: A Rider Card containing the power of Kamen Rider Ouja. Used by Diend to summon Kamen Rider Ouja. First used to battle the Oni Rider Brothers, Ouja is quickly possessed by Ryutaros. This card is also included with the DX Diendriver toy and also used by Diend in Kamen Rider Battle: Ganbaride and Kamen Rider: Climax Heroes.