Dazai is a 16 year old boy with mildly wavy, short, dark brown hair and narrow dark brown eyes. His bangs frame his face, while some are gathered at the center of his forehead. He is quite tall and slim in terms of physique. He works for the Port Mafia and he has a partner named Chuuya Nakahara. Chuuya is quite short with a petite. He has grey eyes. Dazai finds Chuuya adorable and loves him.