As a general question, I'd be tempted to ask to anyone who played BG2 if they ever found themselves thinking something among the lines of "Man, this game was good, but IF ONLY I COULD REPLAY THE WHOLE THING as Jaheira/Viconia/Minsc/Edwin/whatever, that would be the best thing ever witnessed in RPG". I know the thought never even crossed my mind, frankly.
No, never. Because I can't even start to imagine how the game would even play out. CHARNAME is vastly different from everyone else, everything is about CHARNAME and the whole story and all events revolve around them. They dictate what to do, how to do it, when to do it. Even if you get to replay the game as one of the companions and get to dictate what to do in minor quests and events, the most important events will be about CHARNAME and beyond your influence. I don't know what it would feel like, playing the game when everything is about someone else. Certain parts wouldn't make sense without major rewriting, like at the beginning of the game when Imoen opens your cell door: it wouldn't make sense that she would ignore CHARNAME and open someone else's cell first. Unless, of course, you rewrite that part, maybe have CHARNAME hidden somewhere and so Imoen can only find the companions first.
Replaying the game as different characters only makes sense if you at least get to do different things that yield different results and reactions in the world (even if these characters are not precisely "equal" in terms of role in the story). Something like DAO's origins. I played DOS2 twice and the second time I already played a custom character, and after that I was done. My question is: what is the point of replaying as different origin characters?. In DAO some NPCs will react to you differently based on your origin, but in DOS2 you can just switch to the origin character and have them do the talking, and there, you have your origin quests. All critical NPCs will still be there, greet the characters the same way, give you the same tasks which play out in the same manner.
This "origin characters" idea can still be good if these characters represent the different ways for you to start the game (in other words, like DAO origins, but maybe on a more extensive level), and after that you get "standard" companions that have nothing to do with the whole origin bs.
"We make our choices and take what comes and the rest is void."
