Right... if anyone's seen/read Naruto then they can play =) we don't play as the actual characters in the thing and don't have them in it at all (well... maybe occasionally but not as, like, a main character or anything) it's mainly just to pretend to live in Naruto's world.
You can have multiple characters at different levels but don't have say... 5 at an elite level, try and balance out the ranks a bit more. Put your character's details first, k? ;) Don't create your characters as a squad. Your characters should be balanced out between different squads. It should be written in 3rd person as well (he, she, it etc.) to avoid confusion.
Start by introducing your character as follows:
And any other information you may want to include. Also, to avoid too many Kyuubis (if that's how it's spelt) only one of your character may have one. You may also create characetrs as time goes on, you don't have to create them all at once.
Also only one of your characters may be directly related to a main character in Naruto. =) Make any background story believable (if you get what I mean...?)