I'm a bit of an ameteur game programer and we have a little saying that goes like this:
"You won't make an MMORPG so stop thinking about it"
I agree done correctly a naruto MMORPG could be nice but you can't just say you've got an idea and instantly rally round people to work on it for free. Even if a proper development studio made one it wouldn't be the best idea because where are the children that watch naruto going to get enough cash to stump up for there new naruto style everquest addictions?