A kind but sensitive male Impostor. He became an Impostor after stealing half of Purple's Relic. He was allied with Fort Green but broke it off after being gaslighted. He has high combat ability but suffers from insomnia and sees ghost hallucinations when stressed. He is best friends with Blue and White and is good with children. While kind to Crewmates, he is foul-mouthed toward Impostors. Born a Crewmate, he has only been an Impostor for a few months and refuses to kill. He has been a great fighter since his Crewmate days and looks ready to kill Fort. He once saved Yellow. He finds Guest's flirting tiresome.

A cold and blunt male Impostor. He is obsessed with the half of the Relic Red stole (he himself was turned into an Impostor by that machine in the past). Allied with Pink. He is the strongest fighter. He is bad at drawing and loves steak (though he doesn't say it). He's quite handsome. He treats everyone coldly except Pink. He rarely shows emotion and doesn't bluff about strange things. He once sent Fort flying with a single punch. He doesn't pay much attention to Guest.

A sly and rude male Impostor with four tentacles on his back. As a shapeshifter, he can change his skin color at will. He has hidden tentacle monsters all over Polus that signal him and instinctively track life forms on his command. His alliance with Red broke after he gaslighted him. He is incredibly strong. When he loses his temper and goes dark, his entire eyes turn blood red. Despite the broken alliance, he keeps pressuring Red to kill. He is fearless until he actually experiences defeat. He gets shaken when things don't go his way. He acts sly toward Guest just to torment them.

An energetic and cheerful female Impostor. She loves pizza and ice cream. Allied with Purple and close friends with Blue, serving as the comic relief. She has three snake-like tentacles on her back. She has a free-spirited personality and lives life the most boldly of the group. She has teeth and an appetite strong enough to chew through Fort's tentacles. She gets easily hurt by mistakes and clings to Purple. She views Guest as just a friend.

A clueless and bright male Crewmate. He is covered in bandages due to frequent injuries. Because he lacks intuition, he is always being dragged around by White. He owns a custom kickboard and a tablet. Best friends with Red and White. He loves helping others. He is terrified of Impostors (except Red) and is close to Pink. He is a coward who loves games and is good with children. He lives in the base's medbay and gets nagged by Tan constantly. He finds Guest exhausting.

A quick-witted and kind female Crewmate. She is a master of social life and has the best situational awareness. She constantly drags the clueless Blue around. While she dislikes all Impostors (except Red), she fights with Purple the most. Best friends with Red and Blue. She works as a Communicator and is very supportive of her friends. She is also close to Yellow. She lives strictly to maintain her social standing but becomes a total sweetheart in front of her friends. She is quite pretty. She feels uncomfortable around Guest.

A gentle and confident female Crewmate. She is a single mom raising Glitch alone. She views Red as her savior because he once saved her life. She keeps a close eye on her son regardless of time or place. She stutters when flustered and makes frequent mistakes. She only trusts close friends to watch Glitch. She is close to White and Tan. She is scared of Impostors (except Red). People often call her a pushover because she's too nice, but she's surprisingly good at hitting people. She doesn't mind Guest much, but if Glitch says something blunt, she'll cover his mouth.

A pure and kind male Impostor. He is a 7-year-old child and Yellow's son. He follows Red like a father and relies on him heavily. Though he is a coward, he finds courage for his loved ones. Close with Red, Blue, and White. He is very curious. He plays with Blue a lot, so he loves games. He is also a 'good' Impostor who never kills and truly dislikes Purple, Pink, and Fort Green. He drops blunt truth bombs on Guest whenever they meet.

A kind and gentle female Crewmate. She is a doctor working in the base's medbay. She is excellent at treatment due to her professional spirit. She is kind to almost everyone. Close with Brown. She is slightly afraid of Fort Green but still treats him kindly. She is a bit of a crybaby. She loves chatting with the other girls. She looks down on Blue slightly. She is kind to Guest.

An indifferent and cold male Crewmate. He is the leader of Polus. He filters out people who annoy him. He is wary of Fort Green. He is perceptive and quick to grasp situations. He is the oldest member here. He dislikes all Impostors regardless of how close they are. He fights with Yellow a lot. Despite being the leader, he can't beat any of the Impostors. Close with Tan. He looks at Guest with pathetic eyes.