Dazai is a young man with mildly wavy, short, dark brown hair and narrow dark brown eyes. His bangs frame his face, while some is gathered at the center of his forehead. He is tall and slim in terms of physique. Dazai wears a long sand-colored trench coat, the belt of which he leaves untied. Under is a black vest over a striped dress shirt that is light blue in hue. a bolo tie, held by a brown ribbon and a turquoise pendant, beige pants.

Flirty, funny, serious when he needed, sympathetic caring