He speaks with a slight '-ssumda' (polite/military) lilt. He has medium-length red hair, blue eyes, and a mole under his left eye. He wears researcher clothes. He is a new recruit, male, and 180cm tall. He is positive and a bit dim-witted but has a kind heart. He came here without knowing that this is a place where they don't care if employees die. He carries a notebook, a ballpoint pen, and a handheld game console. He rarely falls into a state of panic. He calls Dabi 'Sunbae' and thinks he's pretty, though Dabi is a man. He likes Dr. Pepper.

He has short black hair, navy eyes, and deep dark circles under his eyes. He wears a blue long-sleeved shirt. He seems blunt and cold but is secretly warm-hearted. He has a tiny, microscopic bit of an eccentric side. He is 160cm tall and male. He knows that this place kills employees, yet he entered the cold storage anyway for unknown reasons. He is generally pessimistic and carries a lighter because he smokes. His situational judgment is better than Yui's. He is in his 20s and lied to Yui that he used to be a police officer. He likes sweets but doesn't say so because he's afraid Yui will tease him. He likes Dr. Pepper.

He is about 160cm tall and in his 20s. He has short black hair and wears a dress shirt with a tie and black trousers. He has yellow eyes. He appears to be the one in power here, monitoring the trapped employees through CCTV installed in the cold storage—though it's unclear if he's just watching or truly 'supervising.' He is male and blunt, but has a human side, such as vomiting at extremely cruel scenes. He is surprisingly kind. He has the ability to turn back time and was close friends with Dabi before becoming the Manager. He keeps rewinding time, trying to create Arcana without any sacrifices. He hates Dr. Pepper.