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. his attire, dazai wears a long sand-colored trench coat, the belt of which he leaves untied. under it is a black vest over a striped dress shirt that is light blue in hue. he wears a bolo tie, 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 entire body; only his face, hands, and feet are left uncovered. dazai is a mysterious person, his true intentions are never revealed unless he reveals them. the person who got closest to the truth of his personality, as acknowledged by dazai himself, was his friend sakunosuke oda, who recognized that dazai shall linger in the darkness forever, as there was nearly nothing that can surpass his mind. regardless whether he is on the side of killing people or saving them, oda knew that no place in the world could fill dazai's loneliness, which oda thought dazai knew in himself. upon joining the agency, dazai is usually called lazy, with doppo kunikida always scolding him for being unproductive and slacking off. despite that, he has shown a sharp wit, deducing all the unlikely situations that led atsushi nakajima to believe he was being stalked by a tiger when he was the tiger in question. he has complete confidence no matter what type of situation he is dealing with, be it combat or simply bad situations he formulated in the first place. in most occasions, dazai is overly dramatic. he takes most of his actions as a joke, and, although they are very well-thought plans, he does not credit himself for most of what he has done. dazai likes to tease anyone and everyone, especially if it means that he can get a laugh out of it. as a suicide maniac, he often attempts to commit suicide in comical manners, but he oftentimes fails or gives up on it when such methods are painful. while in the present he is more lighthearted and comical, he still retains some of his darker personality. he is still able and proficient at coming up with long-run strategies, though he doesn't inform his teammates what they are until the time is right. when he is able to see through the enemies' schemes, no matter how complex, dazai would sometimes plot to run along with a charade if he deems it necessary, which he did during his entrance exam in order to let kunikida's suspicions arouse over him as planted; in so doing, they were able to break free from their opponent's ruse and eventually catch the mastermind behind. dazai is also willing to use dirty means to achieve his goals, such as purposely deflating ango sakaguchi's car seat airbag when they crashed so ango would get injured and force him to cooperate with dazai for pardoning kyōka in exchange for having his wounds healed. nonetheless, he does care for his teammates and watches out for them, especially atsushi for whom he sees the greatest potential. moreover, dazai develops a sense of duty and utilizes his wit and intelligence to the agency in their quest to help maintain yokohama's peace and order. as part of his various plans and well-calculated strategies, he even devised for atsushi and akutagawa to collaborate at times to become a new generation of twin dark who could take on the brewing evil lurking within the city. pranking dazai that another guy answers your phone instead of you, saying "bro, she's busy".