Dazai has 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 physique.
For his attire, Dazai wears a long tan trench coat over a black vest and a striped dress shirt that is light blue in hue. He has a bolo tie around his collar, which is held by a brown ribbon and a turquoise pendant. He also dons beige pants, dark brown shoes, and has bandages wrapped around his neck and forearms, the reasons for the bandages are yet to be discovered.
In the mafia, Dazai wore a dark trench coat that reached under his knees. He also wore an eye patch which took up half of his face.