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QuentinThe leader of the gang. He is a cop and claims that he can read people's minds to tell if they are criminals or not.
- Face–Heel Turn: He starts off as the hero of the film, but then he thinks that the others are against him, especially Holloway, so in the scene where she's hanging on the rope of clothes to check the outside of the building, the others pull her up. Quentin, who is at the front, holds her hand, he stares at her and then he lets her go. He then is the villain from there on forth.
- Hair-Trigger Temper
- Jerk Ass
- The Leader
- Psychic Powers: Well, at least he thinks he has.
- Properly Paranoid
- Scary Black Man: And HOW!
- Sir Swears-a-Lot: By far the most profanic character in the film.
LeavenThe youngest and the brains of the operation. She multiply numbers in her head as the only way to get through the rooms is if the numbers of the small tunnel of each doorway is prime.
- Jerk with a Heart of Gold: She's REALLY mean to Kazan. Later she warms up to him
- The Rainman: A much more normal example than most.
- The Smart Guy
David WorthThe one guy who everyone is suspicious of. He turns out to be the designer of the outer shell of the Cube.
Helen HollowayA free clinic doctor. She is very hysterical. She takes care of Kazan.
- Large Ham
- Mama Bear: To Kazan
- Properly Paranoid: I WAS RIGHT! NO-ONE'S GONNA CALL ME PARANOID AGAIN!
KazanA man with Autism. It turns out he can multiply even greater numbers in his head than Leaven.
- Character Tic: Being Autistic, he twitches his fingers and starts tapping his head with his hand if something distresses him.
- Final Girl: Male version
- The Rainman: To the point where they actually take lines from the movie Rainman.