Voadam
Legend
I think most people would generally think of all of these characters as decently high level characters in D&D terms and not as low level characters.In the fiction, neither Zorro nor Batman nor Indiana Jones nor Boromir nor Green Arrow nor Conan nor . . . has magical or supernatural power.
If we want a RPG that permits a player to play a PC whose adventures are likely to unfold in a similar fashion to any of these characters, we will need something that works pretty differently from low and probably even mid-level D&D. And if we want it to be an entertaining game to play, we will probably want rules for failure and success that are different from typical D&D - for instance, emulating one of these characters by simply stepping up their numbers so that victory against "mundane" obstacles is more-or-less guaranteed may not make for very satisfactory play.
Boromir might be a mid level character. Batman the original animated series might be low to mid level, in animated justice league he is definitely high level.