So many of the best are not in the list: Vimes, Carrot, Angua (is it slightly weird to start fancying a fictional lady werewolf?!), and Vetinari to start with.
I'm also very fond of some of the minor characters, like P'traci the handmaiden, Edmund De'Ath, Victor the Holy Wood actor, Didactylos the philosopher and the history monk (is his name Lu Tze?)
But best of all are Brutha and the Great God Om <holy horns>
- I just love them! Not to mention that 'Small Gods' is the best critique of established religion I have ever read.....
BFR