You mean we've actually got to chose! They're all good.
I'll try to make a shor list.
Susan, Death, Magrat, Lu-Tze (rather obvious consitering i'm the Sweeper), Vimes, Vetinary, Rincewind, The Librarian, Gasbode, Death of Rats, oh and I almost forgot Albert. I think I'll stop there, but I haven't thought of everyone. I like the witches quite a lot, but not as much as some on this list.