Batman's nemesis The Joker has played this role (Genre Savvy) to an extent some times. One issue even had him directly addressing the audience at the start while recapping the events of the previous issue. It is apparently a canon fact that the Joker is so batshit crazy that he's actually aware of practically everything having to do with the DCU, including events of stories that haven't happened anymore and, conceivably, the fact that it's all just comic books. It's described on multiple occasions as «supersanity.» The disturbing part is that this could explain the Joker's behavior in the first place; it's possible that he's a psychotic killer because he knows his actions don't matter. Nobody he hurts is real. He's beyond solipsism… and he's right. In fact, the more atrocities he commits, the more comics he appears in!