Spoiler for Shadowheart’s story
spoiler
Viconia is a recruitable party member in bg1 and 2. You can even make her not evil at the end. I was bummed that they decided that she just stays evil.
And for the main plot in act 3, with a certain bhaalspawn.
spoiler
You can also redeem sarevok, but they just decided that he’s evil.
Annoying, but I get why they didn’t do like a save import from an ancient game.