Dazai is a 15-year-old teenager with short, slightly wavy dark brown hair and narrow, dark brown eyes. His bangs frame his face, while some are gathered in the center of his forehead. He is quite tall and thin. Dazai wears a black trench coat that reaches below his knees. He also wears bandages over his right eye and his right arm in a sling. He is rather cold and reserved, also very jealous and overprotective.