What we need is a superhero who's just a guy with a crappy office job who wants to make the world a better place, and his only tools are his sense of justice and a costume he bought at a garage sale. Someone so utterly unremarkable that they just use their regular name as their superhero name.
That's right, I'm saying we need an Arthur movie.
...more realistically, I think we could use more stories about regular people who made a difference just by be being good people.