I got 16, 52%, which I thought was pretty good since I hadn't seen anything Batman since my kids were young in the 1980s, but it still wasn't good enough to score any points. :(
Then it should specify live-action actors, as you also say that a voice actor is "playing" a role. And both Arnett and Conroy voiced Batman in theatrically-released movies, so.
Besides there being endless variations of spelling R'as's full name, I also found myself trying League of Assassins, which seemed to fit the clue as well.
Took me awhile to get Two-Face. The hint does make sense, but I kept getting hung up on the physical transformation aspect of Jekyll/Hyde and that led me away from the answer. I even tried Man-Bat before the answer finally came to me.
I even tried Clayface and Solomon Grundy. I agree. The answer is obvious once you get it, but with just the clue written like that, it doesn't really jump out.
Please also accept legal names for the villains! I couldn't for the life of me remember which iteration of Dr/Mr/Captain and Cold/Ice/Freeze was the Batman one (so many in different mediums and for different superheroes) but I *did* happen to remember that his name was Victor Fries! :P