I just had a suggestion when the game will be more "complete":

The Stage mode should be the story of the leaf village starting the first episode in shippuden. So stage 1 should be when they go at the Sand and the enemies should be something special that I'd call "Ghost Ninjas" since Akatsuki is only composed of 10 members. They are simply ninjas in the enemies side. I feel it doesn't make sense to fight the Sand & Leaf nins and that's why I though of them (like when you play spiderman in a Nintendo Wii, the common enemies are not real in the series but the boss remains). Also the characters selection would only show the "good guys" and the bad guys like Team Hawk and Akatsuki would only be able if you tap the code: "nslf2" in your keyboard (for example). SO then when you play Stage mode, you have the good vs evil and VS mode would be free4all.

so the "normal" charakter selection would only include naruto & co. ... sounds cool^^ hahaha
about the Ghost nins: it would be cool if the "officiers", lil bit stronger enemies (mark, jack, soccer...), wear the akatsuki cloaks xD so we can see something like a herachie in akatsuki hahaha xD

lol would be sweet