The Harley Quinn character was created by Paul Dini and Bruce Timm, and first appeared in Batman: The Animated Series in September 1992. She later appeared in DC Comics' Batman comic books, with the character's first comic book appearance in The Batman Adventures #12 (September 1993). Harleen Quinzel becomes fascinated with the Joker while working at Arkham Asylum and volunteers to help treat him. She falls hopelessly in love with the Joker during their sessions, and she helps him escape from the asylum more than once. When Batman returns a badly injured Joker to Arkham, she dons a jester costume to become Harley Quinn, the Joker's sidekick. The Joker frequently insults, ignores, hurts and even tries to kill Harley, but she always comes back to him, convinced that he truly loves her.
Cloth, Removable Jester’s Hat
Everybody Loves a Legendary Super Hero or Villain