Olivia is the Amicistale version of Frisk. She is the 8th human to descend from the Surface to the Underground.
Olivia's personality is made by the player. She is open-minded, kindhearted, caring and compassionate in the True Pacifist and Ruthless, Coldhearted, Emotionless and Violent in the Genocide. Her soul trait is the same as Nitro, red for Determination.
She has black shoulder-length hair, straight bangs, black eyes and fair skin. Her face is similar to Swap Chara's.
She wears a black shirt with red stripes, black shorts and black shoes.