"She  is  a flamboyant  super-villain  and  an  adversary of Batman usually recognized as the Joker's girlfriend, although she has had her own strong solo career. Born Harleen Quinzel, she had been working as a psychiatrist at Arkham Asylum where she was assigned to the Joker and fell in love with him. This led to her adopting her own costumed persona, adapting the word harlequin, to assist him escape and cause further mayhem. Their relationship is passionate and continuously off-on, with Harley's best friend Poison Ivy constantly encouraging her to break up with him for good. However, Harley's love for the Joker eventually brings her back to his side with the Joker himself demonstrating a keen need for her despite himself. When not with the Joker, she has been working mostly on her own in Gotham City, sometimes teaming up with her other friends. Her special abilities include an enhanced physiology due to chemical experimentation, giving her increased strength, agility and durability. She has been a member of the Secret Society of Super-Villains  the Secret Six, the Gotham City Sirens, and the Suicide Squad.."