Dazai is a young man 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. For his attire, Dazai wears a long sand-colored trench coat, the belt which he leaves untied. Under it is a black vest over a striped dress shirt that is light blue in hue. He dons a bolo tie, beige pants, dark shoes and bandages around his arms, neck, chest, waist and legs.