Kirbi is a 32 year old robian biolizard living in the sonic world, residing in the space colony ark. He's plump (unknown why). He was affected by the metal virus, something he's embarrassed to admit (he thought he'd be able to cure it). He has the powers of a biolizard. Being affected by the metal virus took away the need of the biolizard life support system. He could leave the ark if he wanted to (typically by means of chaos control).