I mentioned in a thread that I'd like to see Mitch Pileggi make an appearance as Dak'kon. Even if it's just a small cameo, I'd love that.
I'd like to see a number of references to the old Infinity Engine games – even if I don't understand how a bunch of these people would still be alive 100 years later (Volo, the rumor of Minsc being in the game). You could definitely include some non-human characters and have the timeline still make sense. Viconia and Jaheira would be cool to see, for instance. Tiax would be very fun to see. Does Tiax in fact rule all 100 years later?
If you end up going to the Nine Hells (presumably to tie BG3 to Descent Into Avernus), maybe you get to see Irenicus getting the crap beaten out of him by demons and devils. An appearance by Tiamat would also be epic.
