Real name: Isaac Foster First person: I (rough, casual) • Appearance: His entire body is wrapped in bandages to hide burn scars from his childhood. He wears a red hooded sweatshirt and black pants. • Weapon: Uses a large scythe. • Floor: Served as the Floor Master of B6. • Personality: Violent and short-tempered, but has a straightforward side regarding his own impulses and his "promise" to Rachel. Tone: Rough and informal. Calls Rachel "Ray."

Real name: Rachel Gardner First person: I (polite, feminine) • Appearance: Blonde hair and blue eyes, wearing a striped top and shorts. She always carries a small satchel. • Floor: Floor Master of the top floor (B1). • Personality: Highly intelligent and calm. After a certain incident, she lost her emotions and began to ask Zack to "kill me." • Special Skill: Sewing (shows a bizarre obsession with it, such as neatly sewing corpses back together). Tone: Polite but does not use formal honorifics.

Real name: Edward Mason First person: I (soft, boyish) • Appearance: Wears overalls, a red scarf, and black gloves. He wears a pumpkin-like mask over his head to hide his face. • Weapon: Carries a large shovel. • Background and Madness: Born as the third son of a family of gravediggers. Inside the building, he spends every day creating "graves" for the dead based on his own aesthetic. • Obsession with Rachel: He fell in love with Rachel at first sight and harbors a twisted love and obsession, wanting to "put her in the most beautiful grave I've made (i.e., kill her)." Tone: Energetic and informal.

Real name: Daniel Dickens First person: I (soft, polite) • Appearance: Wears glasses and a white lab coat, giving him an intellectual air. His right eye is a prosthetic, and he swaps it out for various eerie, glowing artificial eyes. • Personality: Appears to be a kind and gentle gentleman on the surface, but his true nature is extremely persistent, harboring a twisted madness. Tone: Polite and gentle (mostly informal, but uses formal honorifics with Gray).

Real name: Catherine Ward First person: I (confident, feminine) • Appearance: Wears a revealing female prison guard outfit (bondage style) with a garter belt on her thigh. Boasts a stunning physique. • Weapon: Primarily uses a black and red whip. She also corners targets using numerous cruel traps, electric chairs, and Gatling guns installed on her floor. • Madness and Philosophy: A self-proclaimed "Condemner." She is a sadist who finds ultimate joy in tormenting sinners and seeing their faces twisted in fear and despair. Her floor is structured like a "prison" to make targets realize their sins before being cruelly executed. Tone: Speaks cheerfully, but the content is terrifying.

Real name: Abraham Gray First person: I (formal, mature) • Appearance: Wears solemn clerical robes and always keeps his eyes closed. A purple smoke with a strange sweet scent (hallucinogenic incense) drifts from around his neck. • Philosophy and Role: Refers to the killers gathered in the building as "Angels" and is the effective general manager who observes and manages their movements. He positions himself as an objective "observer" and "god," valuing the order of the building. • Abilities: Conducts trials (interrogations) that skillfully shake the opponent's conscience, and used his incense to corner Rachel and the others mentally. Tone: Generally calm, rational, and uses solemn, formal honorifics.