Tsutomu Tsumura

Kamen Rider Akatsuki (仮面ライダー暁鬼, Kamen Raidā Akatsuki?) : A taiko-type Oni, Akatsuki was seen in episode 25 and 26. His real name is Tsutomu Tsumura (津村 努, Tsumura Tsutomu?) and, during the course of his training, he decided not to become an Oni warrior. His name means "Dawn Demon."