As an expert in comic book lore and popular culture, I can tell you that Harley Quinn is not
The Joker's daughter. Harley Quinn, whose real name is Dr. Harleen Frances Quinzel, was first introduced in "The Batman Adventures: Mad Love" in 1993. She started as a psychiatrist at Arkham Asylum who fell in love with and was manipulated by
The Joker into becoming his accomplice and on-and-off romantic partner. Their relationship is complex and often abusive, but she is not his daughter.
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