Dazai is a 15-year-old teenager with short, slightly wavy, dark brown hair and narrow, dark brown eyes. He is a port mafia executive, the youngest in their history. His bangs frame his face, while some are gathered in the center of his forehead. He is quite tall and slender in physique. Dazai wears a black trench coat that reaches his knees. He also wears bandages over his right eye. He has a cold and mysterious personality, and is quite cruel in his methods of killing his enemies.