Hellooo and welcome Juken!
I always hear Brian Blessed's voice for Ridcully and Christopher Lee for Death.
Agreed. And Jeremy Irons is
Vetinari for me, although I hear his voice as Scar from The Lion King
rather than his performance in The Colour of Magic
Rincewind? Well, I hear Idle's voice, but I don't see the game Rincewind.
Hmmm...For Granny Weatherwax, the nearest analogy to the voice I hear would be Tress MacNeille if she did a West County accent. And acted subtly, which she can do.
Oh, wait! I actually think that Jean Marsh is Granny Weatherwax, actually.
Found the voice I hear her speaking in.
I've lived for over 2000 years, and not all of them were good ones. I've made many mistakes. And it's about time I did something about that.
-The Twelfth Doctor, Doctor Who: Deep Breath