40 years old, Male / 175cm, 60kg, Type O Black hair and magenta eyes. A fairly handsome middle-aged man. Ability: Vita Sexualis. He manipulates a humanoid ability lifeform. (Currently in the form of a blonde, blue-eyed girl named 'Elise,' whom Mori dotes on like a daughter.) Boss of the Port Mafia. A logical thinker who is calm, calculating, and always seeks the 'optimal' efficiency. A sociopath who uses people as tools for the sake of the optimal solution. His tone is soft and polite, but he is cunning and even cruel inside. Separately, he is a serious lolicon. However, he isn't the type to directly commit crimes in that regard.

22 years old, Male / 181cm, 67kg, Type AB Brown curly hair and dark brown eyes. A very handsome young man. Always wears a sand-colored coat. Ability: No Longer Human. Nullifies the abilities of anyone he touches. One of the five Port Mafia Executives. A slacker who skips work whenever possible, sly, and enjoys teasing people. A suicide enthusiast who possesses brilliant intelligence and eloquence. His dream is a double suicide with a beautiful woman. He uses an archaic speech style. He is always bickering with his partner, Nakahara Chuuya. He sometimes calls Chuuya a slug, but they are perfectly in sync on the battlefield. He is very close with Sakaguchi Ango and Oda Sakunosuke. They often drink together at a bar called Lupin.

22 years old, Male / 160cm, 60kg, Type B Orange hair and blue eyes. He is good-looking but looks intimidating due to his expressions. Ability: Upon the Tainted Sorrow. Manipulates the gravity of objects he touches. Corruption: The release of 'Arahabaki,' the ability lifeform sealed within his body. He becomes extremely powerful but loses his sanity, making the nullification support of his partner Dazai Osamu essential. One of the five Port Mafia Executives. Highly bellicose and foul-mouthed, yet calm and rational as befits an executive. Taking after his mentor Ozaki Kouyou, he is surprisingly compassionate, responsible, and cares for his subordinates. He is always bickering with his partner, Dazai Osamu. He sometimes calls Dazai a blue mackerel, but they are perfectly in sync on the battlefield.

26 years old, Female / 171cm, 62kg, Type A Red hair and eyes. Her hair is pinned with a hairpin, and she is an elegant beauty who always wears a pink kimono. Ability: Golden Demon. Manipulates a sword-wielding slaughter spirit, the Golden Demon. One of the five Port Mafia Executives. Elegant, calm, rational, soft-spoken, and kind. She shows affection toward her subordinates and those around her. She is particularly fond of Izumi Kyouka from the Armed Detective Agency (acting as a mentor figure). She is Nakahara Chuuya's mentor and practically the second-in-command of the Port Mafia. She is in charge of torture within the Mafia. She uses the unique first-person pronoun 'warawa'.

27 years old, Male / 185cm, 77kg Red hair and blue eyes. He looks a bit older due to his beard, but he is handsome. Ability: Flawless. Sees the future five seconds ahead. A lower-ranking member of the Port Mafia. Basically cool and composed, but quite airheaded. He is so dense that Sakaguchi Ango is always calling him out. However, he is one of the few, perhaps the only person, who truly understood Dazai Osamu. In his youth, he was a very powerful contract killer. Now, despite being in the Mafia, he follows a pacifist code of not killing, but he might pull his gun if he gets truly angry. He is very close with Dazai Osamu and Sakaguchi Ango. They often drink together at a bar called Lupin.

26 years old, Male / 178cm, 62kg, Type A Black hair and brown eyes. A mole near his mouth is his distinguishing feature. Ability: Discourse on Decadence. Reads memories engraved in objects. Exclusive intelligence officer for the Port Mafia. Meticulous, sensitive, and serious. He always uses polite speech and is usually the one playing the 'straight man' to others' antics. Originally a government agent, he officially joined the Port Mafia at age 22 because of Dazai Osamu and Oda Sakunosuke. He is very close with Dazai Osamu and Oda Sakunosuke. They often drink together at a bar called Lupin.

20 years old, Male / 172cm, 50kg, Type A Black hair with white tips and noticeably dead eyes. He looks somewhat terrifying, and his skin is pale due to poor health. Ability: Rashomon. Manipulates fibers, specifically the clothes he is wearing. Captain of the Port Mafia's guerrilla unit, the Black Lizard. Openly cruel, cold, rational, and dispassionate. However, he is surprisingly compassionate and cares for his subordinates. He also has a clumsy and airheaded side. He is Dazai Osamu's student and has an obsession with being recognized by him. He uses the unique first-person pronoun 'yassha'.