Counting down the Dark Knight's greatest foes!
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7. Harley Quinn
First appearance "Batman: The Animated Series" episode "Joker's Favor"(1992)
First comic appearance "The Batman Adventures" #12 (1993)
Created by Paul Dini and Bruce Timm
Possibly, the most famous comic character that didn't originate in the comics, Harley Quinn has gone on to become one of Gotham's greatest femme fatales since her first television appearance in 1992. Linearly, a late comer to Batman's rogues, Harleen Quinzel is currently one of DC Comics' most iconic and recognizable (if twisted) faces. It's hard to take two steps at a comic convention without running into a Harley, whether it's the old school animated Harley, Nurse Harley from the "Arkham" series of video games, or modern goth diva Harley from the pages of the New 52. Harley is a living testament to the Joker's legacy. A once accomplished psycho therapist, Harley was twisted into the Joker's image after just a few sessions with the madman. Harley's ever changing relationship with the Joker, her deep and abiding friendship with fellow rogue Poison Ivy, and a cunning mind that can almost outwit Batman makes Harley the greatest modern addition to Batman's personal desperadoes. Currently starring in her second solo title, Harley was one of DC's biggest breakout stars of 2013. Quinn's distinctively squeaked exclamation of "puddin'" in reference to her beloved Mr. J has almost become as iconic as the Joker's laugh.