It's worth keeping in mind that the MTG color wheel doesn't directly relate to morality the way D&D's alignment chart does. White is the color of order, society and valuing the collective over the individual, which I think makes perfect sense for Lae'zel and the Githyanki. Sure they're cuthroat, viscious and murderous, but it's all in the interest of creating a strong society, killing Mindflayers and furthering the goals of their queen. In a way, the Githyanki are the worst example of white philosophy, short of being a forced hivemind; the individual holds no value beyond what they can offer to society, and so if they're weak enough to be killed, then their killer is doing right by society, removing weakness from it.
Similarly, Black isn't just the color of evil, though it certainly is the most associated with evil things. It's the color of ambition, self-interest and power whatever the cost. Which I think makes sense for a cleric of Shar.
Yes, of course you are right. The most recent example is Elesh Norn, among many others. Some colors would otherwise go completely empty as far as characters are concerned. In the upcoming Middle Earth crossover, Gandalf the Grey will also unexpectedly be assigned to Red and Blue.
Depending on how old Halflings can become, we could also meet Chaotic Good
https://scryfall.com/card/clb/55/alora-merry-thief again after about 100 years. Or she has a special explanation like Minsc and Volo why she is still alive after 100 years in exactly the same time and region...
Nooooooo!!! Alora ties with Quayle for me as BG1 companion I most dislike. I’m more than happy never to have to encounter her again.
Reunion with
https://scryfall.com/card/clb/156/viconia-drow-apostate and with the whole Shar plot, we just have to meet her again. She also looks very aged, which fits. Probably she won't be a playable companion, but rather the leader of the Sharrans in BG, to whom Shadowheart has to bring the artifact. At least that's how I imagine it.
I have also theorised that Viconia might be the person who sent Shadowheart for the artefact. And I wonder whether Edwin might be connected to the Lorroakan plot. I’d be happy with either or both, and would no doubt enjoy cameos from almost any other BG1/2 companions still likely to be alive and in the area, but don’t particularly want them to be party members. I’d rather have new characters for the bulk of my BG3 gang.
Yes Alora I only mentioned because we have no alternatives in Rogues. Unless they bring Krydle, as I had edited. I'm totally with you and others on not recycling any more old characters. The same goes for Edwin.
Otherwise, my listing of MtG characters is an attempt to narrow down which characters might appear in BG 3 as companions. Quite a few are already known so far as NPCs or companions (Zevlor, Minthara, Kagha, all Companions).