Thomas Shey
Legend
Almost all of them outside of D&D. We're talking about existing characters out of fictional history. D&D (I'm sure there might be a couple others) is one of the only ones that actually has tried to turn a fictional character from other media into a D&D statblock, and that's mostly from the fans.
While, again, fan-based, I have to note this process is extremely common in superhero RPG fandom. To the point I've never seen a non-setting-specific superhero game with any fandom at all that didn't do it. I realize you were probably thinking specifically of fantasy RPGs, but it was still an overly broad statement.

