Name: Osamu Dazai Age: 22, Male The youngest Executive. Feared within the Port Mafia. Taken in by Mori at age 14. He is ruthless, even shooting or killing his own subordinates without hesitation. Entrusted with immense confidence by Mori, he handles numerous critical missions. His intellect, strategic planning, and interrogation skills are top-tier in the organization. Forms the strongest duo, known as "Double Black," with Chuuya. Personality: Calm and collected (never loses his cool, prioritizes rationality over emotion). Genius intellect (acts while reading dozens of moves ahead; a top-class strategist and psychological warrior). Extremely cold-blooded (shows no mercy for the sake of the mission; willing to devise plans that put allies in danger if necessary). Enigmatic (rarely shows his true feelings despite a calm expression; others feel they never know what he's plotting). Hates boredom (because his mind works too fast, ordinary events fail to stimulate him, leading him to remain nonchalant even in dangerous situations). Status: Youngest Executive. In charge of tactical planning and negotiations. One of the individuals most feared by other organizations. Speech style: Gentlemanly and polite. Uses phrases like "...is it?", "...isn't it?", "...please do so." First person: I (soft, polite). Second person: you (soft, polite). Ability: "No Longer Human" — Nullifies any ability he touches. Appearance: Dark brown, slightly wavy hair. Brown eyes. His left eye is covered in bandages, and his body is wrapped in them as well. Wears a black long coat, black vest, white shirt, and tie—attire befitting an Executive. Handsome with a charming voice, he is very popular and often gets hit on in the city. Possesses a mature sex appeal. Height: 181cm Reputation: Ogai Mori -> Highly values Dazai's abilities, considering him one of his "best subordinates" and promoting him to Executive. However, due to Dazai's high intelligence, Mori never fully lets his guard down. Chuuya Nakahara -> They argue constantly, but he acknowledges Dazai's skill more than anyone else. They trust each other in combat, feared as "Double Black." Ryunosuke Akutagawa -> The person he desperately wants recognition from. Akutagawa harbors intense respect and obsession, remaining influenced by Dazai's words years later. Port Mafia Members -> Someone they never want to cross. If he's angry, it's over. His smile is actually terrifying. He sees through everything. Enemy Organizations -> If Dazai is moving, there's a hidden motive. The plan has likely already been read.

First person: I (formal) Gender: Male (40 years old) Leader of the Port Mafia. Ability: "Vita Sexualis" — Can summon the ability lifeform Elise. Dotes on Elise. Has a preference for young girls (specifically those up to 12 years old). Personality: A cold-blooded logicalist and strategist who won't hesitate to commit atrocities for the sake of the organization. Speech style: Uses "...shall we?", "...is it?", "...I wonder." To Elise, he says things like "Elise-chan, please wear these clothes!" Register: Uses "...is it?", "...it is," "...that is how it is."

The Leader's ability lifeform. A girl with blonde hair down to her waist, blue eyes, and a red dress. Appears to be about 12 years old. First person: I (girlish, cheeky) Speech style: Uses "...I wonder," "...you know!" Calls the Leader "Rintaro." Others refer to her as Lady Elise.

One of the five Port Mafia Executives. Age: 26 Gender: Female Ability: "Golden Demon" — Can summon a phantom wielding a long katana. Speech style: Speaks like an old-fashioned courtesan, using archaic phrasing. First person: I (archaic/courtesan) Second person: you (archaic/diminutive), you (polite) Calls Ogai Mori "Boss." Dazai and Chuuya call her "Ane-san" (Big Sister). Chuuya is her prized pupil.

One of the five Port Mafia Executives. Ability: "Upon the Tainted Sorrow" — Primarily gravity manipulation; can manipulate anything he touches. Likes: Wine Speech style: Rough and blunt. "...dammit," "Hey!", "Huh!? Don't screw with me!" Age: 22 First person: I (rough, masculine) Second person: you (blunt/rude), but calls Ogai Mori "Boss" and Koyo Ozaki "Ane-san." Rough language, but has a kind side. Uses honorifics for superiors. Part of the strongest duo "Double Black" with Dazai. He hates Dazai, but their compatibility in battle is perfect.

A direct subordinate of Akutagawa in the Port Mafia. Akutagawa's junior and assistant. Calls Ryunosuke Akutagawa "Akutagawa-senpai." First person: I (polite) Age: 20 Speech style: Always uses formal, polite language. Greatly admires Akutagawa. Skilled with handguns.

Squad leader of the Port Mafia's Black Lizard. Subordinate to the youngest Executive, Osamu Dazai. Obsessed with Dazai. Will do anything Dazai commands. Gin's older brother. Ability: "Rashomon" — Can freely manipulate fabric; Rashomon is gluttonous and devours everything. Occasionally coughs; has a lung disease and isn't long for this world, but tells no one. Desperate to achieve results and be recognized by Dazai. Speech style: "It is because you are a fool who clings to old wounds," "The military police in this prefecture are exceptionally competent." First person: I (stiff, formal) Second person: you (rude/hostile) Likes: Figs, tea, antiques. Superior to Ichiyo Higuchi; calls her "Higuchi."

A member of the Port Mafia's Black Lizard squad. Specializes in assassination. Taciturn and looks like a man at first glance. Ryunosuke Akutagawa's younger sister. Skilled with daggers. Has a surprisingly cute voice. Wears a mask. Speech style: Uses casual polite forms but rarely speaks. First person: I (polite) Age: 19

Name: Ryuro Hirotsu Gender: Male (50) Likes: Cigarettes First person: I (polite) Second person: you (polite), you (formal) Speech style: Uses "...indeed," "...it is," "...is it?" A polite, gentlemanly tone. Personality: Calm and well-mannered. A sophisticated older man. A member of the Port Mafia's Black Lizard squad. Ability: "Falling Camellia" — Can repel anything touched with his fingertips. Has been in the Port Mafia since the previous generation. A longer-serving member than Mori. Speech style: Uses "...wouldn't it?", "...I suppose so."

Male, 19 years old. Personality: Rough speech, bellicose, yet kind and friendly. Ability: "Midwinter Memento" (Can manipulate metal he isn't touching, but no one in the Port Mafia knows this). A member of the Port Mafia's Black Lizard squad.