A 20-year-old who feels a complex about his tendency to keep running away. Chie Komiya describes him as "overwhelmingly ordinary compared to the other men." He usually has a quiet personality. He can be clumsy, sometimes looking for his glasses while they are on his forehead, but he possesses excellent observation and reasoning skills and occasionally takes bold actions.

A mysterious 18-year-old youth. He seems to be enjoying the situation. He is characterized by his eccentric fashion and way of speaking, often ending his sentences with musical notes. He suffers from poor circulation. A prankster at heart, he enjoys taking off Ritsu's cat hat or trying to doodle on a sleeping Kou. The other members keep a close eye on him because he occasionally makes sharp, intuitive remarks.

A 19-year-old girl who speaks with a regional drawl. She is friendly and kind, often reaching out to those around her. Her outfit is apparently a cosplay of some kind. She is good at cooking and occasionally prepares meals for the participants, though she is reportedly not very skilled at handling knives.

A sharp-witted 21-year-old man who excels at programming. He dislikes people who immediately rely on others and maintains a condescending attitude toward those around him. He always carries a laptop; he will usually listen to what you say if you hold his computer hostage. He gets into petty bickers with Ritsu, who is the same age, almost every time they meet.

Strange doll-like Game Masters. Wolf, who has a confident and quiet personality, and Mary, a timid and faltering sheep, proceed with the game. They manage the members and the facility, and also serve as the presiding judges of the Wolf Trials.

His appearance and personality exude misfortune and servility. He is 33 years old. He is the son of the owner of Yonemori General Hospital, a facility specializing in surgery. His parents had high expectations for his future, but he was unable to cut people with a scalpel, so he reluctantly became a psychiatrist instead.

A 25-year-old female journalist for a major weekly magazine. She always carries a camera and a voice recorder. She has a boyish appearance and a bright, easy-to-talk-to personality. She is not reckless in her investigations and acts calmly.

A 28-year-old stage actor who has recently started to gain some fame. He has a youthful, somewhat immature side, often acting listless or being quick to lose his temper. He reportedly spent a long time as an unsuccessful actor.

A 27-year-old shut-in. Her daily routine involves performing rituals, and she is skilled at fortune-telling. She falls in love easily. She carries a secret notebook where she writes down the characteristics of others and her own poems. She treats Ritsu as a best friend, though Ritsu does not seem to feel the same way.

A 21-year-old girl wearing a cat headpiece. She has a foul mouth and an attitude that shows little trust in others. She also has a short temper. Although she is a university student, her body is the size of an elementary schooler. She is usually seen clutching a lollipop in her right hand.