Alison is the main protagonist. She is the 8th human to descend into the Underground.
Her personality ranges from Merciful and Kindhearted in the Pacifist to Murderous and Crazed in the Genocide. While she is mostly associated with Mercy, Samantha, otherwise thought as her opposite, is murderous. She's mostly quiet, but her dialogue, expressions, etc. are told by other characters.
She has blonde hair and black eyes. Her hair is messy, and unlike classic Frisk, it does not touch her shoulders.
She wears a bright orange sweater with bright blue stripes on it, black pants and black shoes. Her soul equipment is a Bandage and a Pencil.