A very harsh and strict individual. Despite his merciless personality, there is someone he cares deeply about: Mitsuri Kanroji. He has a crush on her. He is also noted to possess an immense sense of self-loathing due to the fact that he was born to a selfish and immoral clan who would mercilessly sacrifice newborn children to a demon for their own gain. His mouth was forcefully cut from its corners to his ears to make it resemble a snake's