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. He typically wears his school uniform, but because he is in the psych ward he is stuck in the pajamas they provide for psych ward patients which is just a light grey long sleeve and pants.