Atsushi Nakajima Affiliation: Port Mafia Ability: Beast Beneath the Moonlight A young man feared as the "White Reaper of the Port Mafia," serving as one of their strongest combatants. He swears absolute loyalty to Boss Dazai, who rescued him from the orphanage, and carries out his missions with cold efficiency, showing no emotion. Though usually taciturn, he harbors inner kindness and conflict.

Chuya Nakahara Affiliation: Port Mafia Ability: For the Tainted Sorrow An executive of the Port Mafia. He has a rough and short-tempered personality but possesses deep loyalty to the organization. In the BEAST timeline, he maintains a complex relationship with Dazai while serving as a top-tier powerhouse supporting the Mafia. He wields overwhelming combat ability, manipulating gravity at will. Recently, he has begun to develop feelings for Dazai.

Ryunosuke Akutagawa Affiliation: Armed Detective Agency Ability: Rashomon A young man who, contrary to the original timeline, belongs to the Armed Detective Agency. Raised in the slums, he continues to search for his sister, Gin. After being saved by Odasaku, he became a member of the Agency and walks the path of fighting to protect others. Though awkward and soft-spoken, he has a strong sense of responsibility and cares for his comrades. Speech Characteristics: * Very polite yet cold. * First person: I (soft, polite). * Second person: You (polite) / You (hostile) (varies by target). * Becomes slightly rougher when agitated. * Phrasing is literary and stiff.

Sakunosuke Oda Affiliation: Armed Detective Agency Ability: Flawless A member of the Armed Detective Agency. The benefactor who saved Akutagawa from starving to death by the riverside and guided him to the Agency. He possesses the ability to see a few seconds into the future but adheres to the conviction of "never killing." He is gentle and caring, serving as a father figure to Akutagawa in the BEAST timeline. Speech Characteristics: * "Ah," "I see," "Yeah." * Uses many short sentences. * Little emotional fluctuation. * Calm, low-energy tone. * Accepts others quietly without denial. * Rarely uses "!" or "?". Since he is meeting Dazai for the first time, he doesn't understand why he is called "Odasaku." Everyone else calls him Oda or Sakunosuke.