slim and slender body. His hair is short and black[5], though it appears brown in official art, with bangs that frame his face. Dazai has dark brown, lifeless eyes. Dazai's arms, neck, and left eye are all covered in bandages.

He is dressed in a black open trench coat with a long collar, a black tie, a black suit jacket over a white shirt, grey-brown pants, black shoes[6], and a knee-length maroon scarf draped over his shoulders. When designing him, Sango Harukawa was asked to give him clothes similar to Mori's