Harley Quinn first debuted in the Batman cartoon series: The Animated Series episode “Joker’s Favor” (1992). After appearing in cartoons, Quinn appeared in The Batman Adventures # 12 (1993).
Fully named Harleen Frances Quinzel, this character was created by Paul Dini and Bruce Timm.
Initially Harley Quinn was a psychiatrist named Dr. Harleen Quinzel was assigned to care for the Joker at Arkham Asylum.
Harley Quinn is immune to poison thanks to the power given Poison Ivy. Has extraordinary intelligence. As you all know, Quinn once worked as a psychiatrist and also a therapist in a nursing home. Besides intelligence, Quinn also has super powers and significant fighting skills. Harley Quinn really admires animals. In fact, in the comics, he has two hyenas, aka coyotes, Bud and Lou.
When Quinn was in prison, he was forced to join Task Force X or better known as Suicide Squad.