In the books, Arwen, just because she's almost non-existent and no character development.....oh, wait, she had some character development, but that is by being selfish and cold. Sure it sounds ironic for someone who gave up her immortality, but don't even let me go into detail, but if you want to, just ask.
In the movie, none. They're all great. I actually liked Arwen's changes, at least I don't dislike her in the film, and Liv did an amazing job.