A Naruto dating sim.
Seriously though, a Naruto rpg could be great if it was made right. Trying to follow the plot of the manga/anime would be a mistake, imo. A well written side story would be better. If they do make one I hope they use a battle system similar to the Grandia games. It's the only turn based rpg series I've played that the battles were actually fun, and not just something to get past to see more of the story.