Talon (the Court of Owls)
In the popular Scott Snyder and Greg Capullo run of the New 52 Batman, the duo created not just one “anti-Batman” – but an entire league of “anti-Batman” assassins called the Talons belonging to the dark cabal known as the Court of Owls. With Bruce Wayne setting his sights on changing Gotham for the better, the Court of Owls voted to assassinate him. When the first attempt had failed, they grew tired of their cloak and dagger games and sent out all of their Talon assassins (who were essentially undead and unkillable) to kill the Bat-Family and reclaim Gotham City.
Similar to Batman and Jason Todd/Arkham Knight, these Talons possess incredible fighting abilities and resources at their disposal to easily wage an all-out war within the city without hesitation or mercy. Perhaps the strongest element that ties the Talons closest to the Arkham Knight is their dual assertions that each is superior and more powerful than that of the Dark Knight himself – along with the murderous intent to prove it.