Oniwakamaru is the person that worked for Sasaki Ryujiro and was thought to be an ogre.
Oniwakamaru is a bald, fat, tall, muscular man. He has a somewhat wrinkly face with a swollen right eye that appears closed and two scratch marks on the left side of his face. He wears a brown cloak that has a hood with a darker brown short-sleeve shirt underneath it. He also wears wraps around his wrist and ankles.
Oniwakamaru is a very nice person but from being tortured and being called names through his life time he can also get out of control when people talk about him or even see his face.
He has showed compassion towards Fuu when Sasaki tried to kill her.
He was tortured by the residents, of where he used to live, being set on fire by torches.