HARLEY QUINN is a character appearing in American comic books published by DC Comics. Harley Quinn is a humorous henchwoman for the supervillain Joker in Batman: The Animated Series. Harley Quinn's abilities include expert gymnastic skills, proficiency in weapons and hand-to-hand combat, complete unpredictability, immunity to toxins, and enhanced strength, agility, and durability. The character has a pair of pet hyenas, Bud and Lou, which sometimes serve as her attack dogs. As a trained psychiatrist with a genius level intellect, she is adept at deception and psychological manipulation.

Since her conception, Harley Quinn has become one of DC Comics' most popular and profitable characters, and has been featured in many of DC's comic books. DC Comics co-publisher Jim Lee considers Harley Quinn the fourth pillar of DC Comics' publishing line, behind Superman, Batman, and Wonder Woman.