In Deadman Wonderland prison, Senji is know as the Raven. He has dark skin, muscular body, and short black hair. He loves battles and he is Ganta's first opponent. He has special rings on his fingers which are blood-dripping. His blood materialises in the form of blades which makes him a close-ranged fighter. Senji is a former policeman. This makes him disciplined man. He sympathizes with Ganta and helps him in controling his abilities.