His men captured Harleen and strapped her to an electro-shock table, where the Joker administered electro-shock therapy, that combined with the Joker's twisted influence completely warped her mind. Harleen took the name "Harley Quinn" and became the Joker's girlfriend and accomplice.
As their sessions went on, Quinzel was gradually manipulated by the psychopath, using her own feelings of insecurity and disrespect she felt by the Arkham staff members. Eventually she fell in love with him, and she and the Joker began an escape plan.
The Joker gradually seduces Quinzel and gets her to fall madly in love with him. He later persuades her to release him, subjecting her to shock therapy in retaliation for her using it on him, and manipulating her into jumping into a vat of the same chemicals that disfigured him to prove her love for him.
The theatrical version showed Joker pushing Harley Quinn out of the helicopter as a means of saving her, though the original scene was rumored to display Joker committing the act as a means of trying to kill her.
This is how lore accurate Batman would've beaten the Suicide Squad (Animation)
Who is Joker's true love interest?
Following her introduction to the comics in 1999, Harley Quinn was depicted as the sidekick and lover of the Joker as well as the criminal associate and best friend of Poison Ivy.
The Clown Prince of Crime responds by yanking Harley's shirt and screaming in her face, reminding her that she will never meet his comedic standards. At this point, the tension has disappeared, morphing into verbal and physical abuse.
The Joker commits a crime and, cornered by the Batman at the Monarch Playing Card Company, throws himself into a vat of chemical waste. He survives, but becomes horribly disfigured in the process. This is the first and earliest attempt at providing a background for the Joker, written in 1951.
Aside from the fact that he is a monster with no cause other than gleefully causing destruction, she has a much more personal reason to despise him -- his abusive behavior toward Harley Quinn.
Though originally a villain and enemy of the Batman, she has ended her relationship with the Joker and continued a career as an anti-heroic vigilante, and even teams up with the Dark Knight and the Bat Family on several occasions.
It is from this Bruce deduces that the Joker does not care who Batman is; he only cares for Batman, and that to acknowledge Batman's true identity would spoil the Joker's "fun".
While the two worked together for years, the only one keeping any semblance of a relationship alive was Harley. Truthfully, the Joker was never that interested in Harley, save as someone he could easily leave holding the bag during his criminal endeavors.
The Joker uses aporia to manipulate people and control them to achieve his goals. The Joker is able to break down the established identities of his targets through doubt and uncertainty. Batman and Harvey Dent are both vulnerable to the Joker's manipulation because of their own identity crises.
In Injustice: Gods Among Us, Harley Quinn reveals she gave birth to Joker's daughter, but gave her up for adoption rather than subject her to a life with Joker as a father. Similarly, Harley becomes a mother to twin children in the Batman: White Knight universe, though with happier results.
Like most breakups, this one didn't happen overnight. During the “Death of the Family” storyline, Harley grew alarmed at just how much the Joker had changed and how nothing was fun anymore. The final straw for her was when he infected her precious hyenas with rabies in 2012's Suicide Squad #15.
The Clown Prince of Crime and the Dark Knight have been matching wits since the 1940s, and in that time they developed a bond unlike any other pair of fictional arch-enemies - with the Joker confessing his love for bats on multiple occasions.
Nicholson's Joker was a criminal who was physically and mentally altered after falling into a vat of hazardous chemicals. Heath Ledger's iconic take reinvented the character for a new age, permanently imbuing the clown with angst.
The Joker has had various possible origin stories during his decades of appearances. The most common story involves his falling into a tank of chemical waste that bleaches his skin white and turns his hair green and lips bright red; the resulting disfigurement drives him insane.
The big hook, however, were the stories he told her of his childhood, rife with abuse and violence. Seeing a wounded soul crying out for attention through his super-villain antics, Harleen fell in love with the Clown Prince of Crime and even broke him out of Arkham after his latest arrest at the hands of Batman.
During more sessions, Harley's mind started to snap as her infatuation for the Joker grew, until one point, she helped him escape, dressing up like a harlequin jester to further try to endear herself to the psychopath, knocking out several guards in the process and taking on the new persona of Harley Quinn, the Joker's ...
The story opens with the Clown Prince of Crime declaring he's fallen in love -- not with Harley Quinn or Punchline, but with one of Harley's best friends, Power Girl. Created by Gerry Conway and Ric Estrada, Power Girl debuted in the pages of 1976's All-Star Comics #58 as the Supergirl to Earth-Two's Superman.
