Shinagawa is very skinny and flexible. He has a narrow face, with a long and pointy nose. His pupils are also very narrow. He has a very long and snake-like tongue. He clothes resemble a smoking with green decorations. He wears a black cap.
At some early point in his life, he was taken in by Mōzuri Gazuchi who opted not to kill him. Living alongside Gazuchi, Shinagawa became a serial killer with a preference for women. When they caught him, he eagerly tried to get to his closet. When they opened it, they found clothes made from the black hair and scalps of women. He was sentenced and taken to Deadman Wonderland, where he was recruited into the Undertakers.