Gwess (グェス Gwesu) is a tertiary antagonist and, later on, tertiary ally featured in the sixth part of JoJo's Bizarre Adventure, Stone Ocean. She is introduced in the "Prisoner FE40536: Jolyne Cujoh" story arc as Jolyne Cujoh's first enemy Stand user. Gwess is introduced as Jolyne's cellmate. She soon decides to shrink the newcomer with her Stand, Goo Goo Dolls, but is defeated and becomes Jolyne's flunky.