Since I just read it yesterday: Aragorn's character arc does exist, but it happens entirely off the page, relegated to a lonely appendix. :-| By the time we "meet" him in the books, he's already close to the end of his journey, and has already been through most, if not all, of his major trials. Kind of an author fail, IMO, since those trials are, for the most part, not even referenced in the story.