We've seen Lae'zel who appears to be a well made as is Gale, but not Shadowheart, Astoria, or Wyll.
Given its 5 BG3 Companions so far, I think one tied to each colour of the MtG colour pie makes sense. Lae'zel has white, Gale blue, and while Wyll's creature card hasn't been spoiled yet, he has an instant spell named after him Wyll's Reversal which which basically allows him to redirected a targeted instant or sorcery to new targets, and if he gets a luck die roll he can copy the spell his redirecting and choose new targets again, this suggests his card is going to be red (and interact with dice rolling). Alternately maybe he will have Legendary Mizora creature token when he enters the battlefield, the way Minsc has Boo, or maybe both Dice Rolling and a D20.
That leaves just black and green, I'm leaning towards black for Astarion and green for Shadowheart, but that doesn't fit right, although I did not expect Lae'zel to be mono white either.
