Sure. But there are literally millions of outside influences on any one person. Even if you are looking at just basic biological facts you're getting so little of what goes into any one persons decisions.
Mushishi is the most un-anime of any anime I've seen. Probably because it's originally based on some short-stories.
It's very similar to House actually now that I think about it. The episode starts, a problem arises, and the "doctor" finds a way to solve it. except instead of medical problems it has to deal with these plant-like creatures called "Mushi", so it's kinda super-natural.
but the main guy, Ginko, is this quiet older guy, not some teenage animu character. The medium is anime, yeah, but there isn't much about it that IS anime.