Characterization. Ledger described the Joker as a "psychopathic, mass murdering, schizophrenic clown with zero empathy". He embodies themes of chaos, anarchy and obsession, expressing a desire to upset Gotham's social order through crime and his conflict with BatmanOverview

Harley Quinn. a DC Comics character, was created by Bruce Timm and Paul Dini for Batman: The Animated Series.

She first appeared in the 22nd episode. "Joker's Favor", on September 11, 1992, as the Joker's henchwoman. Harley