Did anyone bring up Princess Mononoke? Is that considered anime, or just animation? Ah, who cares.
Ashitaka: Intense, serious, reserved. Definitely I. That one was easy. The real question becomes everything else.
Ashitaka is defined by tranquil fury, or the tendency to become deadly serious when it gets deadly serious. More importantly, his giant can of supernatural whoop-ass is uncanned in the name of stopping the fighting and making the point that hatred solves nothing. He forcibly inserts himself in the badass knife-fight between Eboshi and San, both of whom look like they've been saving all their bloodlust for this singular opportunity to cut the other the eff in half, and neither of whom ever seem to betray a flicker of doubt regarding the rightness of their cause.
I was having trouble deciding between NT and NF until I realized that Ashitaka is an idealist. His goal from the very beginning of the story is to "see with eyes unclouded by hate," and as the primary go-between of the opposing factions, he sees that neither side is intrinsically bad, and that both sides are actually capable of quite a bit of good. Their refusal to coexist, to forgive, to see each other's strivings as legitimate, is the main source of the conflict.
Still can't decide between INFP and INFJ. I first thought that he emoted his judging function like Js do--he's not really shy about stating unequivocally what his purpose is and what he thinks is right, and he's calm and polite while still not tiptoing around others' feelings, which is why for a minute I thought him a T--but at the same time he seems to entertain from the beginning shades and shades of gray, like how Eboshi is ruthless in her expansion of Irontown but ineffably gentle with the lepers she takes in--and he does this to a degree that seems more like textbook Ne. He has a moment of doubt where he almost leaves (like a P?), but then he's pulled inexorably into the fighting once again.
Hmmm. I don't know. In the end, he's the one who sees and understands and desperately tries to reconcile the two sides. Definitely some kind of INF.