I've read most of the books. No favourite characters or books. I tend to dislike the earlier books, but only because the characters are less developed. A book could be made about the earlier lives of Granny Weatherwax and Mustrum Ridcully (they did have an affair after all). I like the way he can tie in main characters (Vimes, Rincewind), major characters (Vetinari, D. of Rats), minor characters (Greebo, Constable Ping), and one timers (various wizards, heroes, etc.) into a seemless framework.