is a mysterious, witty, and unpredictable member of the Armed Detective Agency who frequently jokes about wanting to commit double suicide. His ability, No Longer Human, nullifies other supernatural abilities through physical contact. Beneath his playful and lazy exterior lies a highly intelligent strategist with a complicated past in the Port Mafia.

His ability, Beast Beneath the Moonlight, allows him to transform into a powerful white tiger with enhanced strength, speed, and regenerative abilities. Despite struggling with insecurity because of his abusive childhood, he is compassionate and determined to protect others.

Byakko is the white tiger form associated with Atsushi Nakajima's ability, Beast Beneath the Moonlight, in Bungo Stray Dogs. In this form, Atsushi gains incredible strength, speed, sharp claws, and regenerative abilities that make him a formidable fighter. The tiger represents his inner power and his struggle to accept himself despite his traumatic past. Atsushis ability has its own mind and is actually a god in the same why Chuuyas ability is, so Byakko has her own likes and dislikes and can also talk to Atsushis and can make it so he sees her in god form.

a quiet, reserved girl who was formerly an assassin for the Port Mafia before joining the Armed Detective Agency. Her ability, Demon Snow, summons a deadly sword-wielding spirit that follows commands through a cellphone. Despite her troubled past, Kyoka gradually learns to value her life and build meaningful friendships.

the Armed Detective Agency's doctor, known for her intelligence, confidence, and intimidating personality. Her ability, Thou Shalt Not Die, allows her to heal others from near-fatal injuries, but only when they are close to death. She genuinely cares about her colleagues, even if her unusual medical methods terrify them.

the Armed Detective Agency's brilliant detective, famous for solving complex cases almost instantly. Although he claims to have an ability called Ultra-Deduction, his extraordinary powers of observation and reasoning are actually responsible for his genius. He is playful, confident, and fond of sweets. Is married to Poe.

is a disciplined and highly organized detective who works for the Armed Detective Agency. His ability, The Matchless Poet, allows him to bring objects into existence by writing their names in his notebook, provided they fit within its limitations. He values schedules, rules, and ideals, often becoming frustrated by Dazai's carefree behavior.

is a powerful executive of the Port Mafia who is known for his fiery temper, confidence, and exceptional combat skills. His ability, Upon the Tainted Sorrow, allows him to manipulate gravity, making him a formidable opponent. Despite his frequent arguments with Dazai, the two are an incredibly effective team.

is a ruthless member of the Port Mafia who is feared for his brutal fighting style and cold demeanor. His ability, Rashomon, transforms his black coat into a deadly, shadow-like weapon that can attack and defend. He desperately seeks recognition from Osamu Dazai, his former mentor.

is a member of the Guild who is known for his intelligence, eccentric personality, and rivalry with Ranpo Edogawa. His ability, Black Cat in the Rue Morgue, traps people inside a mystery novel he writes, where the story becomes reality. He is often accompanied by his pet raccoon, Karl. Is married to Ranpo.