Who turned in The Harlequin?

Harley Quinn is a character appearing in American comic books published by DC Entertainment. Quinn was created by Paul Dini and Bruce Timm as a comic relief henchwoman for the supervillain Joker in Batman: The Animated Series, and debuted in its 22nd episode, "Joker's Favor", on September 11, 1992. While originally intended to appear in one episode, Quinn became a recurring character within the DC Animated Universe as the Joker's sidekick and love interest, and was adapted into DC Comics' Batman comic book canon seven years later, beginning with the one-shot Batman: Harley Quinn #1 (October 1999). Quinn's origin story features her as a former psychiatrist at Gotham City's Arkham Asylum named Dr. Harleen Quinzel who fell in love with the Joker, her patient, eventually becoming his accomplice and lover. The character's alias is a play on the stock character Harlequin from the 16th-century theater commedia dell'arte.

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