Kamen Riders' Crossover Forms

These are Rider Forms assumed by Kamen Riders that feature elements outside of the Riders' native series.

Kamen Rider Decade

 * Decade is able to assume the form of various past Kamen Riders, for a full list see Kamen Rides. Both Decade and Diend's Complete Forms allow them to use the powers of past Riders as well.

Kamen Rider OOO

 * Kamen Rider OOO
 * Tamashii Combo (OOO, Den-O, All Riders: Let's Go Kamen Riders) *erased from existence due to restoration of original timeline.

Kamen Rider Gaim

 * Kamen Rider Gaim
 * Wizard Arms (Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle)
 * 1 Arms (Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai)
 * Kamen Rider Baron
 * OOO Arms (Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle)
 * Kamen Rider Ryugen
 * Double Arms (Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle)
 * Kamen Rider Zangetsu
 * Fourze Arms (Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle)
 * Kamen Rider Fifteen (Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai)
 * Decade Arms
 * Fourze Arms
 * Wizard Arms