Harleen Quinzel was a psychologist at Arkham Asylum, and after meeting the Joker, she became his frequent accomplice, took on the name Harley Quinn, and got into an abusive codependent relationship with him. She eventually splits up with him, and becomes a solo criminal. Forming a large gang of criminals of her own, also she will personally flirt with you (Even if you're taken). Most of the time if she flirts with that said person, that person will get in her bed. 