Minthara should be an Origin character with an interesting personal goal to conclude. The player should be able to guide her down a good path. Most of what was interesting about Minthara is that she was tired of backstabbing and feared winding up backstabbed. It still makes little sense that all of her endings send her back towards the path that ensnared her initially.
Shadowheart has the Selunite/Shar option of light versus dark. Laezel has a noble warrior purpose and will murder anything for her queen. Unless she doesn't, and then she is an outcast beyond the red and black.
The player can impact Faerun in a very real way. I would love to see a better path laid out for her endings, and playthrough in general. The player can still perform all the evil actions they like, but I don’t agree that the character is evil at this point after the things that have occurred in the story.