Eh, I think there's some stuff that would fit well, stuff like the more superhero-ish magical girls (Sailor Moon, Precure, Nanoha et all), super robot stuff (there's even precendence for that, what with Shogun Warriors being part of Marvel canon [i]and [/i]being some of the classic super robots), and the straight up western-style superhero stuff like Tiger & Bunny and One Punch Man.  Stuff that would make sense in a superhero setting and all.

...Then again, it's kind of hard to fight street crime whilst at the helm of a twenty meter tall titan of steel, as amusing as that thought is.  Hmmm.

I'm fine either way honestly, though.  Just like to play devil's advocate from time to time.  Besides, the main Japanese superhero thing I'd want to take stuff from if I did go that route is live action anyways. XD