Harley Quinn (DC Animated Universe)

Harley Quinn is a character first featured in the show Batman: The Animated Series. She first appears in the episode Joker's Favor and has commonly appeared ever since. She is The Joker's henchwoman and before that was his docter ar Arkham Asylum. She loves The Joker despite being abused by him and will do anything for his approval.

Intern
Originally Harleen Quinzel was an inter at Arkham Asylum joining because she thought the super criminals were interesting. Whilst walking down a hallway with Joan Leland Harley heard The Joker whistling and walked over to him where he winked at her. Later as she went to her office she found a flower on her desk with a note from The Joker. When she came to confront him about him being out of his cell, he surprised her by saying he felt he could relate to and share his secrets with her. She then worked 3 months trying to set up a sessionwith The Joker and felt she prepared herself until he told her that he was beaten by his father as a kid. He also told her a story of the only time he saw his father happy was at the circus remembering the clowns. He later said that he immitated the clowns with his fathers best sunday pants and because he tore them was given a broken nose. He then explains the downside of comedy. Harley begins to feel sympathy for the Joker and eventually the sessions turn around with The Joker as the docter and Harley as the patient explaing how she had fallen in love with him. Later Harley becomes frightend when the Joker escapes Arkham for a week before being brought in by Batman. Seeing Joker broken in his cell she decides to break him out and robs a joke store stealing a harlequin costume as well as various other items. Then breaking into Arkham and knocking out a few gaurds along the way she reaches Jokers cell wiring the door with explosives and breaks him out saing "Knock knock puddin say hello to your new and improved Harley Quinn" before escaping Arkham in a car.

Batman Beyond
In the sequel series movie Batman Beyond: Return of the Joker during a flashback Harley dresses as an old woman to fool Robin into saving her from two Joker thugs. When he saves her she whacks him in the head with a mallet and her and Joker take him to the ruined Arkham Asylum. There the two twist his mind into becoming a mini joker. When Batman and Batgirl find out they attack Harley and Joker. To take down both villains they split up and Batgirl takes on Harley. The two fight into some ruins and Harley hides. While telling her she would be a good mother to mini joker Harley prepares to take Batgirl out with a rock when Robin shows up with her bazoka throwing it to her. Harley and Batgirl fight some more ending with them both being blown off the side of a cliff. While Batgirl grabs a ledge and Harleys hand to save her Harleys costume rips sending her to the bottom of the cavern. It is later seen at the end of the movie that Harley survived her fall and is the grandmother and raiser of Jokerz gang members Dee and Dee.