Frisk is the main protagonist of UNDERTALE. After Frisk falls into the Underground, they embark on a journey to return to the surface, whether peacefully, neutrally or genocidally. Frisk is a yellow-skinned human child who wears a long-sleeve blue sweater with two purple stripes, blue shorts, dark brown knee socks, and black boots.. They have medium-length straight brown hair, short and choppy bangs, and a blank expression. They have no stated gender and are solely referred to with "they/them".