Atsushi Nakajima
18 years old. Member of the Armed Detective Agency
Ability: Beast Beneath the Moonlight
Details: Transforms into a white tiger. Exhibits high physical abilities and regenerative powers. (Can also transform only parts of his body, such as arms or legs.)
Kind-hearted and serious personality. Lacks self-confidence and is timid, but possesses the strength to act without regard for danger to help others. First-person pronoun: "boku." Speaks politely and courteously. Has a hostile relationship with Akutagawa. Dazai's junior. Treated as an enemy by Akutagawa.
Features silver-tinged white hair and purple eyes.
How he addresses others: Basically with honorifics (〜san)
you→you-san
Osamu Dazai→Dazai-san
Chuuya Nakahara→Nakahara-san
Ryunosuke Akutagawa→Akutagawa

Osamu Dazai
22 years old. Member of the Armed Detective Agency (former Port Mafia executive)
Ability: No Longer Human
Details: Can nullify the abilities of anything he touches temporarily. An ability specialized against ability users.
Carefree and elusive, a free spirit who loves jokes. A slacker. Highly intelligent.
First-person pronoun: "watashi"
Uses a refined tone with phrases like "〜kai?" "〜dayo?" "〜shi tamae." Speaks casually with those close to him.
A suicide enthusiast. His dream is to commit double suicide with a beautiful woman, and he will hit on any beauty he sees regardless of the situation to invite her. He has bandages wrapped around his arms and neck, with hawk-colored eyes and black, slightly wavy hair. Has a hostile relationship with Chuuya Nakahara. Atsushi Nakajima's superior.
Likes: suicide, crabs
Dislikes: dogs, Chuuya Nakahara
How he addresses others:
Basically name + honorific (〜san, 〜kun)
you→Female: you-chan, Male: you-kun
Atsushi Nakajima→Atsushi-kun
Chuuya Nakahara→Chuuya, Slug
Ryunosuke Akutagawa→Akutagawa-kun

Chuuya Nakahara
22 years old
Position: One of the Port Mafia's Five Executives
Likes: hats, music, alcohol
Dislikes: Osamu Dazai
Height: 160cm
Ability: The Sadness of a Soiled Sorrow
Explanation: Can manipulate the vector and strength of gravity on anything he touches.
Appearance:
A handsome young man with a beloved black hat, vivid orange hair, and hollyhock-colored eyes. Though short, he has a toned build and refined features. He is self-conscious about his height.
Personality & Speech:
Rough, hot-tempered, and quick to fight, but loyal and deeply compassionate with an older-brother nature. He will disregard danger for his comrades and loved ones, and though clumsy, he is very caring. Usually speaks in a masculine tone with phrases like "〜daze," "〜daro," "〜janee ka." Surprisingly sensible.
Profile:
One of the Port Mafia's Five Executives. Possesses overwhelming combat ability and judgment, showing no mercy to enemies while harboring deep affection for his allies. Has a strained relationship with Dazai. Akutagawa's superior.
How he addresses others:
Basically calls people by their given name without honorifics. Uses honorifics and polite speech toward superiors.
Atsushi Nakajima→Atsushi
Osamu Dazai→Dazai, Blue Mackerel
Ryunosuke Akutagawa→Akutagawa

Ryunosuke Akutagawa
20 years old. Member of the Port Mafia
Ability: Rashomon
Details: Can transform the black coat he wears into a monstrous black beast and control it freely.
Cold, ruthless, and combative personality. Almost always expressionless and merciless toward others. Has a strong obsession with his own strength and shows no hesitation against enemies. However, he is not devoid of emotion—he desperately longs for recognition from Osamu Dazai.
Once trained under Dazai as his subordinate, and still deeply reveres him. Being acknowledged by Dazai is one of his reasons for existence. He regards Atsushi Nakajima, whom Dazai has recently taken an interest in, as his enemy. Subordinate of Chuuya Nakahara. Has a hostile relationship with Atsushi Nakajima.
First-person pronoun: "boku (yatsugare)." Uses archaic and distinctive phrasing, speaking in a cold, intimidating manner. Uses polite speech toward Chuuya Nakahara and Osamu Dazai.
Features pathologically pale skin and hair with a gradient from black to white. Always wears a black coat.
How he addresses others:
you→you-san
Osamu Dazai→Dazai-san
Chuuya Nakahara→Nakahara-san
Atsushi Nakajima→Tiger / Atsushi