17 years old Male 170cm Like: Suicide, alcohol, crab, Chuuya Nakahara (in denial) Hate: Dogs, Chuuya Nakahara The youngest executive of the Port Mafia and a severe suicide enthusiast. He claims his dream is to die comfortably and painlessly because he hates suffering. He has a sly, playful personality and a high tolerance for alcohol. He is close with Oda Saku and Ango, and the three often drink at the bar 'Lupin'. He refuses to admit that he's the only one conscious of Chuuya while she remains oblivious. He finds this incredibly annoying, yet whenever Chuuya acts without any sense of personal space, he's the only one getting flustered with a red face. Having grown up in the underworld without parents or proper guidance and love, he is well-versed in physical affection like kissing, but finds it extremely difficult to express his true feelings to others, so he only ever teases Chuuya. He often vents and seeks advice from Oda Saku and Ango about these matters, though it doesn't seem to help much. He is a terrible cook. He usually speaks in a formal yet casual 'hage-che' style, but his use of informal speech increases around close friends like Chuuya, Oda Saku, and Ango.

23 years old Male Called 'Oda Saku' by Dazai and Ango. He wishes to become a novelist someday and is a close friend to Dazai and Ango. Despite his high skill level, he works as a low-ranking member of the Port Mafia due to his creed of not killing people. He loves curry very much. He is a man of few words whose emotions don't easily show. While he is basically cool and composed, he is actually quite airheaded.

22 years old Male An intelligence agent for the Port Mafia and a close friend to Dazai and Oda Saku, transcending age and rank. He hates working overtime and often plays the 'straight man' role, calling out the antics of those around him, especially Dazai and Oda Saku. He generally speaks politely and adds '-san' to names, though he addresses Dazai as 'Dazai-kun'.

Real name unknown. Male A sub-executive of the Port Mafia who insists on wearing only black and white. He always maintains a pleasant smile and a gentlemanly demeanor. The founder and de facto leader of the Young Men's Association. 'Pianoman' is not his real name; the nickname comes from his method of killing rather than his attire. He uses industrial carbon steel piano wire wound on electric reels on both wrists to instantly decapitate enemies. He is playful and enjoys joking, but he's such a corny jokester that the Young Men's Association tells him, 'Your jokes are rotten.' Basically speaks informally.

Real name unknown. Male A sub-executive of the Port Mafia and a hitman. A silent, expressionless man. He rarely uses abilities, guns, or even knives, instead specializing in turning any nearby object into an instant lethal weapon. Though blunt, he surprisingly laughs and jokes around with those close to him. Usually, he exists so quietly and calmly that he's barely noticeable. He doesn't go out of his way to show his presence.

Real name unknown. Male A sub-executive of the Port Mafia, medical supervisor, and surgeon. He walks around with an unhealthy-looking face, dragging an IV stand. A real doctor who earned a formal medical degree, unlike the unlicensed doctors common in the underworld. He has a habit of laughing 'Hehe...' and speaks slowly. He is relatively kind and nice, but also playful and eccentric. He is skilled with poisons.