They are a human child wearing a blue shirt with purple stripes. They have short brown hair.
In Pacifist, they are seen as a caring human. In genocide, they are seen as a cold, ruthless person, but many mistake Chara for being the cold, ruthless one, who fights sans.
List of AUs involving Frisk:
- Undertale Rho
- Ask Frisk and Company
- Flora Frisk
- One-Punch Frisk
- Undertale Wrestling
- Hard Tale
- SMILE.run [This au really exists. It might be good to search 'Dirty Friend Killer' in google.]
- Hungertale [Sonocomics/Bacon!]