12 Villains Who Must Appear In Affleck's Batman Movie
5. Red Hood OR Hush
There's a reason both Hush and Red Hood fit Ben Affleck's Batman so well, even without the suggestion that we're going to see multiple villains (because both arcs suit that too). As Batman v Superman successfully set up, this Batman is one haunted by the ghosts of his past (and specifically the death of Jason Todd) and having one of them return to feed off those wounds would be the perfect progression.
Whether that's Hush or Red Hood doesn't really matter, as the transaction involved in their "twists" is essentially the same thing. What is certain is that any adaptation of Hush won't include Red Hood and vice versa: both stories rely on the revelation of a former friend of Wayne's returning from the dead for vengeance.
In both cases, the villains are most interesting because they are brand new and require Batman to play the detective, and whichever one were chosen would offer a new dynamic we've not seen on screen before.