I just finished book 5, which I know is still relatively early in the series, but I like pretty much all the characters. I like that the characters vastly improved from the first couple of books. I hated some of the characters at first, especially Mat, but by the end of book 5, I generally enjoy all the characters, and Mat's especially cool with his whole blood of Manatheran thing going on. They do have their annoying moments but they all feel realistic and in character for the most part.