Originally Posted by asjah8
now, what's even messier is that frodo doesn't really evolve at all; he is a static character. the story evolves via his involvement in everyone else's lives; the dynamic supporting characters. actually, frodo has to be a strong static character in order to carry the spine while the writer plays with povs of other threads. otherwise, the whole thing would fall apart.
Frodo does actually evolve. He comes under the ring's influence and starts to turn darker, so that's one type of evolution triggered by something external. But he also arcs simply because of everything he goes through during the story. When he gets back to the Shire at the end, he realizes he doesn't really belong there anymore. Of course, he has to take care of that little Saruman problem - and he can. He's not the hobbit he was when he left.
I can't remember how it played out in the movies, though. Maybe he was more static in them.