Pffft, just use M&M. Players will likely want to invent their own Codexes and spells, so a point-based system works best for that. Its gameplay style is designed for superheroes and anime characters.
Oh god, it's the "What is YOUR zanpakuto?" thread all over again. (that thread led to the creation of BleachITP - how long before we have BibliographyITP?)You know what? Seeing you guys with your own 'If I were a Page' thing going on is making my day.
I actually thought up this system because I wanted to create something that people could make their own. Like with Bleach's zanpakutos, Naruto's ninjutsu, One Piece's Devil Fruits, Soul Eater's weapons, and the like. I mean, there are rules, but within those rules so much is free.