Introduced in The Fear, the Mother with Sunglasses is an adult female that plays the role of a minor antagonist within the book. She first appears as the leader of the Gym Bunnies, a group of adults, and leads in an attack against DogNut and his crew early on.
DogNut describes her as wearing jogging pants and having her hair pulled back in a crude ponytail. In the skirmish with DogNut's crew, she steals Felix's knife and wields it for the rest of the book.
She wears a pair of sunglasses that she found on a model head inside a shop. On her wrist is a Celtic knot tattoo. Brooke mentions that the mother has boils and spots across her face with black teeth.