Batman: Arkham Knight - 8 Identity Theories You Can Stop Believing

4. Damien Wayne

Something gleaned/confirmed in the comic is just how many members of the 'Bat-family' are present in the Arkhamverse - which is to say only Robin and Nightwing; Tim Drake and Dick Grayson respectively. As we're not dealing with the newest version of Robin seen in the Scott Snyder comics - also known as Bruce's son Damien Wayne - it's safe to say he's not the Arkham Knight. There's just no way that Damien 1. Exists in this universe in some capacity yet hasn't be mentioned whatsoever and 2. Is at an age/physical structure large enough to embody the suit and down Bats himself. The Damian theory was always a stretch anyway, but looking at how Batman addresses those around him, from Alfred to Oracle, Robin and Nightwing, there's nothing to suggest Damian is even in Rocksteady's vision of the mythos at all.