Harley Quinn

Doctor Harleen Frances Quinzel is a former psychiatrist employed at Arkham Asylum and a known associate of the Joker, operating under the alias Harley Quinn. After assisting in the Joker's escape from Arkham, Harleen was submerged in a silo of chemicals at Ace Chemicals, re-emerging as the Joker's right hand woman. Over the years, Harley has become a nemesis of Batman, growing to become known as the queen of Gotham City alongside the Joker,