None of the original companions should be companions in BG3.
They can't possibly do them justice considering these characters already went through an epic campaign and are real epic heroes or villains as such. You can spin a silly tale about Gale and Wyll being archmages who got depowered to level 1 by tadpoles or whatever, but you can't do that to established characters from BG 1 and 2.
Cameos would be cool though. But still the level difference is so huge it might feel forced unless you meet them later. Much later. Or else, why wouldn't an epic level Jaheira just go flatten the Mind Flayers and be done with their plotting.
