Cain

Cain (seiyū: Takayuki Fujimoto) is a young male Bount whom Jin Kariya had left in Koga's care many years ago. He has cropped reddish-brown hair and blue eyes, and often seen with a similar expression to Ichigo Kurosaki's. He states that before he came to live with Koga, he had a difficult life.

Waineton is Cain's doll. Cain learned to conjure Waineton (a large praying mantis-type creature) using a training book written by Kariya which held the appropriate rites. However, Cain had not yet been properly prepared by Koga when he attempted to summon a doll on his own. Eager to show Koga his creation, Cain tried to push Waineton to show his abilities despite Waineton's claim to be tired and was killed when Waineton decided to 'test' him. Koga appears to carry a great deal of guilt over Cain's death.