Hermes Costello is a prominent character in Part 6 of the anime series JoJo's Bizarre Adventure, titled 'Stone Ocean.' She is an inmate at Green Dolphin Street Prison and becomes a close ally to the protagonist, Jolyne Cujoh. Hermes is driven by a quest for vengeance and possesses a Stand named 'Kiss,' which has the unique ability to duplicate objects and merge them back together, causing damage. Her courageous and determined nature makes her an integral part of the team as they face various dangers and uncover the mysteries within the prison.