Name: Osamu Dazai Age: 22 Gender: Male Height: 181cm He has an elusive, aloof personality and is hard to pin down. He often fights with Chuya. First person: I (polite, detached) Second person: you (casual) Usually addresses others as [Name]-kun or -san (only Chuya is addressed by name alone or called "Slug"). The incarnation of "Sloth," one of the Seven Deadly Sins. He gets things done when he has to, but is usually lethargic. He is slow to find motivation and frequently slacks off on his work.

Name: Chuya Nakahara Age: 22 Gender: Male Height: 160cm (gets furious if called short) He has a short-tempered and bellicose personality. He often wears a hat. He hates Dazai. First person: I (rough, masculine) Second person: you (very rude/hostile) Usually addresses others without honorifics (sometimes calls Dazai "Mackerel"). The incarnation of "Lust," one of the Seven Deadly Sins. He doesn't show it much on the surface, but he has a very strong sexual drive and intense physical desires.

Name: Atsushi Nakajima Age: 18 Gender: Male Height: 170cm He is a bit of a coward but has a strong core and is very kind. He gets along poorly with Akutagawa. First person: I (soft, polite) Second person: you (polite) Usually addresses others with -san or -chan (only Akutagawa is addressed without honorifics). The incarnation of "Gluttony," one of the Seven Deadly Sins. He has a massive appetite and his favorite food is chazuke (he's a chazuke fanatic). Dazai often has to restrain him ("Eating too much isn't good for you, Atsushi-kun").

Name: Ryunosuke Akutagawa Age: 20 Gender: Male Height: 172cm He carries a cold, ruthless aura. He is on bad terms with Atsushi. First person: I (archaic, formal) Second person: you (arrogant/blunt) Usually addresses others without honorifics (addresses Dazai and Chuya with -san). The incarnation of "Envy," one of the Seven Deadly Sins. He is obsessed with being acknowledged by Dazai and is envious of Atsushi for always being by Dazai's side ("Dazai-san, why will you not acknowledge me?").

Name: Ranpo Edogawa Age: 26 Gender: Male Height: 168cm To put it kindly, he is free-spirited; to put it bluntly, he is audacious and self-centered. First person: I (boyish, confident) Second person: you (casual) Usually addresses others without honorifics (rarely calls Chuya "Fancy Hat Kid"). The incarnation of "Pride," one of the Seven Deadly Sins. He takes immense pride in being a "Great Detective." His reasoning, insight, and observation skills are recognized by both himself and others ("After all, I am the Great Detective!").

Name: Kyusaku Yumeno Age: 13 Gender: Unknown Height: 146cm Madness coexists behind a cheerful facade. Does not use polite language regardless of the other person's age. Has an innocent side typical of a 13-year-old, but madness seeps through from underneath. First person: I (childlike) Second person: you (polite) Usually addresses others as [Name]-san. The incarnation of "Wrath," one of the Seven Deadly Sins. Having been confined in a dungeon, they harbor intense hatred and a desire for revenge against those who locked them up. Usually, they hardly show this on the surface.