Dazai is a 20 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. Dazai teases Chuuya for his height sometimes