I literally just found this and downloaded the d20 naruto books. I'm familiar with d20 modern, so it'll just take a little adapting to the adaptation rules. I'm pretty solid on Naruto lore, although the First Shinobi war isn't something I know a lot about - except that it is during this war that the Second Hokage dies and passes on leadership to the Third.
I don't, as yet, have a particular concept in mind, so are there any archetypes the game is in need of? I am happy to work towards the idea of becoming a nin/gen/tai specialist, a weapon specialist, a medical nin, team leader etc. If more representatives of a particular clan are desired, I'm happy to look into that too!