Harley Quinn

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 criminal gang called the Quinntets.After breaking free from the Joker, Harley Quinn became something of an antihero as she didn't necessarily follow the law but usually did the right thing in any given situation.