The Joker (Injustice: Gods Among Us)

In the Mainline Universe, The Joker was a criminal mastermind with a sadistic nature to him.

History
The Joker went through various bouts in Arkham Asylum due to his various horrific crimes. Eventually, however, he was secretly broken out of Arkham Asylum via Deathstroke, and was also hired by Lex Luthor to set up a nuke in Metropolis as a contingency plan in case Luthor failed to take control of the Watchtower. The Joker then proceeded to set up the nuke alongside Harley Quinn, although when Batman arrived, he order Harley Quinn to leave (eventually slapping her when she tried to protest). Although he had planned to simply leave Metropolis when the bomb was set and watch the destruction from afar, he ended up changing his goal to setting off the bomb then and there as a "last dance" with Batman, not caring if that meant he himself got killed in the explosion.

However, due to being mysteriously warped to another reality, Joker failed, and then proceeded to blame Batman for the failure of his plans (which he ironically turned out to be correct in his suspicions, as that reality's Batman caused the reality warp that accidentally sucked Batman and himself in in order to bring in Wonder Woman, Aquaman, Green Arrow, and Green Lantern after their equivalents either defected or, in the case of Green Arrow, were murdered by that reality's Superman). He was then forced to flee alongside Batman when ominous forces arrived nearby to arrest them, with Joker also proceeded to kill a driver of an APV and drive over to his old haunt at Gotham City. He also proceeded to kick Batman mid-glide and cause him to break his leg, which allowed him an easy victory. He then attempted to give him a glasgow smile, but was forced to abandon him when he noticed that reality's Hawkgirl and Green Lantern (or rather, Yellow Lantern) arriving, also witnessing Batman being punched and mock-regretting not having his cell phone with him as it would have ensured "many its" on a social media page. He then encountered that reality's Harley Quinn, though she did not believe his claims to be the Joker due to that reality's Joker having been killed by Superman five years earlier until he beat her in battle. He then was recruited by Harley to lead her faction of the resistance, the Joker clan, presumably also getting a 5-U-93-R pill in the process, which he then proceeds to ingest as well as claiming it will increase their strength a hundred fold. Shortly afterwards, a raid was commenced by the Regime, led by Hawkgirl and Nightwing, with Hawkgirl proceeding to fight Joker, though he knocked her out, and then proceeded to decide to clip her wings after mentioning that, getting past the feathers, she was "a lovely girl", although Nightwing confronted him. Joker then proceeded to fight him while hinting that he's not actually the same Joker from this reality (though he was still somewhat evil), although that reality's Batman arrived, alongside reinforcements. Although Harley Quinn suggested recruiting Joker, Batman refused, and the main timeline equivalents of Arrow and the others deduced that the Joker was actually from their own timeline and not the Regime timeline, and also deduced that that must have meant that their own Batman was present in that world, with their eventually learning that their own Batman had been captured by Regime Superman's men. He was later released by Harley Quinn against Batman's orders, with Joker also proceeding to shoot down that reality's Lex Luthor's mobile suit with a stolen APC and rocket launcher, also proceeding to mock Lex Luthor's fall. He then had Harley Quinn try to steal his suit, and when she failed, he then proceeded to threaten to kill her to "give her a severance package", although he in turn was beaten by Lex out of disgust for his treatment of Harley. He then was at the mercy of Harley who deeply considered killing him in revenge, although she was talked out of it by Lex. She then handed him over to the Joker Clan while allowing Lex to go free, makig clear that Joker wasn't on their side. After Superman's defeat, Joker is forced back to his world via gunpoint by Harley Quinn. In his arcade game ending, it is revealed that his exposure to the Joker Clan in the other world gave him an idea to create a similar organization, with his ultimately succeeding in doing so.

Powers and Abilities
To be added