Newsarama presents to you 10 comic book characters that didn’t debut in comic books. Check out the list HERE.

Dr. Harleen Frances Quinzel worked at Arkham Asylum as a psychiatrist, treating Batman’s rogue’s gallery of insane villains. While treating the Joker, she fell madly in love with the psychotic clown, and adopted the personality of Harley Quinn, a harlequin jester, becoming his sidekick, his lover, and a breakout star on Batman: The Animated Series. The character was introduced on September 11, 1992, in Batman: The Animated Series and later adapted into DC Comics’ Batman comic books, first appearing in The Batman Adventures #12