Harley Quinn (Injustice)

This version of Harleen "Harley Quinn" Quinzel was a villain turned heroic character in the 2013 DC fighting video game, Injustice Gods Among Us.

History
Like the prime universe's Harley, she was a former psychiarsit turned criminally insane villianess who dated the Joker. But after the Joker was killed by Superman after The Joker tricked him to kill Lois which triggered a nuclear blastt that destroyed Metropolis and Superman formed The Regime, Batman seemingly reformed her and she's a member of The Insergency who uses the Joker's old gang to cause chaos and disorder to help Batman in his fight against Superman.

Five years after the destruction of Metropolis, Harley ran into the prime universe's Joker. At first she didn't accept the fact that he was the Joker from another reality, and thought he was an imposter. After they fought, she knew it was him and she temporally aligned with him, though she still worked with Batman's Insergency. But shortly after she failed to get Lex Luthor's armor for the Joker, he tried to kill her, but Lex Luthor saved her and told her that she outgrew him after she resisted the temptation to murder him.

After the fall of The Regime, at gunpoint, she escorted the Joker through a dimsional portal that led back to the prime universe and it's assumed that she will help Batman and the transistional government restore Earth's governments.