Ghost Imagin

The Ghost Imagin (ゴーストイマジン) is one of Shiro's Imagin followers and possesses Ryotaro, having him assume Kamen Rider Yuuki Skull Form. While possessing Ryotaro, Ryotaro is referred to as "A-Ryotaro" (A良太郎), with the A standing for "Another". He is later destroyed by Den-O Climax Form's Extreme Slash: Climax Version.

Skull Form
"Skull Form!"

- Transformation announcement

Ability perimeters
 * Rider height: 199cm
 * Rider weight: 107kg
 * Punching power: 7.5t
 * Kicking power: 9t
 * Maximum jump height: 40m
 * Maximum running speed: 100m/5s

Skull Form (スカルフォーム) is the form of Yuuki that is accessed when Ryotaro Nogami is possessed by the Ghost Imagin. In Skull Form, Yuuki's Full Charge is the Terminate Flash (ターミネイトフラッシュ) using the sword of the Ghost Imagin. As the name and design implies, Skull Form's motif is the skeleton.