Osamu Dazai

He is one of the senior employees of the Armed Detective Agency and the partner of Kunikida Doppo. Previously, he was a member of the Executive Committee of the Port Mafia and was Chui Nakahara's partner. Has the ability of an "Inferior Person".He has a very pugnacious and cheerful character, while self-sufficient, periodically accepts suicide attempts. Dazai is a very mysterious person, his true motives will never be revealed unless he reveals them himself. All the time he makes attempts to commit suicide, which causes inconvenience to colleagues. He loves to make fun of Kunikida Doppo, telling him important words first so that he writes them down in his notebook, and then, when he does what he said, Osamu says that everything he said is a lie, as a result of which Kunikida dislikes Dazai and often gives him a good beating. Despite this, Dazai showed an incredibly sharp mind, thanks to which he quickly managed to guess who Atsushi is, which immediately makes it clear that he is a real detective who does not miss a single clue. He keeps complete calm in battles even when the situation takes unheard-of turns.An inferior person is an ability that allows Dazai to neutralize the abilities of another esper through direct physical contact. It does not work at a distance, which is a minus. He can also nullify the ability of being bound if an opponent touches his skin area. According to Ranpo, Dazai's ability is considered very powerful, and there is no person with similar powers among European countries.

Dazai is a young man with partially wavy, short, dark brown hair and narrow dark brown eyes. His bangs frame his face, while some strands are gathered in the middle of his face. He is quite tall and slender. He wears bandages all over his body due to wounds received in battle, and this is also the result of Dazai's attemptsх to commit suicide.