My entry into Discworld was Guards! Guards! and I’d love to see a really good rendition of that. I know a lot of people loves Vimes, and I do too, but I also love Carrot and his werewolf girlfriend and I’d like to see Carrot being Carrot.
I think Susan’s story as the grand-daughter of Death could be great, too.
I know Neil Gaiman has a great deal on his plate shepherding his own works onto the screen, but I wish he magically had a bit of extra time and energy to do something (besides Good Omens) of Pratchett’s.