A little strange discussion of companions. I'll try to dilute it with my thoughts.
First run in BG3 i begin like a warlock with the fiend as patron. After first rest in camp and Karlach quest (and seeing portrait of Wyll ofcourse) i started thinking, that maybe, just maybe, the Larian Studios do some quest for classess and as warlock i will try save my soul in some devil mindgames with my patron... just like in "The Devil's Advocate" oh my! Ah, well, that was just another dream. But i remembered one very good game: Dark Messiah. And ofcourse - Xana, a demon that accompanies player all the way. She is one of my favorit companion, remembering how was changing my opinion about her from start to end of game, when you realised that she was not absolute evil, but still - the demon. I always liked that kind of companion when you dont know what going next: evil, not evil, good, not good. Something like this was in Divinity: Original Sin 2 with gods, or in Neverwinter Nights with Aribeth, well that the point: controversial character.
About races - whould like to see, some bestialy races, i think its great addition, having some "rare" companions make the jorney even more exotic. In Pathfinder you can take a kobold companion (not long), and goblin - that was nice expirience! In DOS2 cool lizard race, some kind of drakonids - wery proud and ambicious, really like them! In Mass Effect series you can fall in love with the alien races and there really good romances.
I like this kind of games for opportunities - the bigger, the better. Wanna be sneaky-peeky pinkhired orc-bastard with tiny knife? Ofcourse! Do you want to be the biggest and tallest in the party? Here - take a goblin, halfling and gnome with you! Liked this sssscales coldblooded lady? Well go and try, maybe she like you too! Or she will just eat you... How about building some kingdom of your own, mm? In DnD we play same way, it's all a matter of taste and having a choise is better part of game.
Sorry for mistakens, my english is not good. And sorry, not everything on the topic.