Mutant girl

The Mutant Girl is a mutant Monster kept in the Facility. She is not listed on the Whiteboard, and is only seen in the behind the scenes footage of the film.

Physical Description and Attributes
As her name implies, the Mutant Girl is a normal girl who was horribly disfigured by some unseen event. Though she may seem similar to the Mutants, she is completely different from them. Unlike the other Mutants who resemble nuclear power plant workers, the Mutant Girl resembles a normal person.

Unlike the other Mutants who have their entire faces disfigured, only the right side of her face and neck is disfigured and swollen. While most of the Mutants who have little to no hair, she has sort of long black hair with a few blue and blue violet strands in it. While most of the Mutants are seen wearing jumpsuits and hospital gowns, she is seen wearing a brown jacket over a pink hoodie. She has a few splotches of green vomit on her chest.

She is also seen with several lip piercings in her top and bottom lip and a tooth gage plug in her right ear. Her clothing style, her color, and piercings give her the appearance of a punk rocker. The Mutant Girl is briefly seen during the carnage of the Purge in the behind the scenes videos "We Are Not Who We Are: Making The Cabin in the Woods" and "An Army of Nightmares: Make-Up and Animatronic Effects". She is not shown attacking anyone because a face designer for the movie was fixing her make up.

Appearances
The Mutant Girl is not seen at anytime during the System Purge or in a Cube Prison. She can only be seen in the behind the scenes footage where the SFX team is doing her makeup. The Mutant Girl could possibly have been put here as a filler-monster.

Inspiration
She may be a reference to Lisa Trevor in the Resident Evil video games.