Harleen Quinzel was a psychiatric intern at Arkham Asylum. A model student, in addition to receiving high grades in college, she was also a dedicated gymnast, winning a scholarship to Gotham City University. While researching the lunatics at Arkham, she became fascinated with one particular inmate. Ambitiously volunteering to analyze him, she pleaded with the doctors at Arkham for three months before she could treat him.
Frequent accomplice and girlfriend of Batman's nemesis the Joker, she is also close to Poison Ivy, from whom she gained her immunity to poisons and toxins. Description from pinterest.com. I searched for this on bing.com/images