The "evil twin" of [[Momotaros]] who appeared in the [[Kamen Rider Den-O (series)|Kamen Rider Den-O]] & [[Kamen Rider Kiva (series)|Kiva]]: Climax Deka movie.

He can transform into another evil twin, this time of [[Kamen Rider Den-O]] Sword Form, named [[Kamen Rider Nega Den-O]].
negataros