This is a very interesting thread, and I hope that I'll have some time in the next few days to add more of my own thoughts.
I
may have mentioned it before

, but I really like BG3s character writing, and I like our companions.
I am not a big fan of the alignment system, I think it is too simplistic, too black and white, and I like that Larian seems to have taken a different, and in my eyes, more complex and realistic approach.
I love that we meet nuanced characters who have their strengths and weaknesses, their histories and experiences that influence their actions and behaviour.
I can imagine different directions of character development for each and every one of them. Maybe our Tav's actions and behaviour towards them might also have an impact on where their stories are going. I hope so.
Personally, I like to play a kind and sympathetic Tav, who might not always agree with everything a companion says or does -and who will say so-, but who will emphatize with them, listen to them. I like the gradual, slow development of relationships between characters, it feels very natural to me. Like Crimsomrider said, it's a reward all of its own, to see the relationships go from a rough start (for some companions) to something more like friendship. I think I am most curious where Astarion's character development might lead, especially with the kind of Tavs that I am playing.
I am very late to the party, I could not watch the PFH live and I am watching it right now. I like that there was a focus on the writing process, it was very interesting and very promising. The complexity of the relationships between characters (not only the romantic ones) are what makes this game really stand out for me.