Harley Quinn was created by Paul Dini and Bruce Timm and first appeared in "Batman: The Animated Series" in the episode "Joker's Favor." She was voiced by Arleen Sorkin.
Harley Quinn made her first appearance in DC Comics in "The Batman Adventures" #12, bridging her transition from animation to comics.
Harley's original jester costume, designed for the animated series, became her iconic look in various media.
In 2000, Harley Quinn received her own solo comic book series, expanding her backstory and popularity.
As part of DC's New 52 reboot, Harley's design and backstory were updated, including a more punk-inspired look.
Harley Quinn was portrayed by Margot Robbie in the 2016 film "Suicide Squad," gaining mainstream movie recognition.
A new adult animated series featuring Harley Quinn was launched, expanding her character and story in animation.
Harley Quinn was the lead character in "Birds of Prey," a standalone film highlighting her story beyond the Joker.
Harleen Quinzel begins her career as a psychiatrist at Arkham Asylum where she meets the Joker.
Harleen falls in love with the Joker, adopts the persona of Harley Quinn, and becomes his accomplice.
Harley and the Joker carry out their first major crime spree together, solidifying their notorious partnership.
Harley Quinn realizes the abusive nature of her relationship with the Joker and decides to leave him to become independent.
Harley teams up with other female vigilantes, including Huntress and Black Canary, to fight crime in Gotham.
Harley Quinn begins a romantic relationship with Poison Ivy, marking a new chapter in her personal life.
Harley Quinn transitions from villain to antihero, working sometimes with law enforcement and other heroes to protect Gotham.
