I have to admit, while I find it fun to speculate on which actors and actresses would best fit the various SoA NPCs... I'm a bit uncertain about there actually being a BG2 movie. Only because movies based on video games are not generally all that good.
Though, hey, there's always a first time for everything, maybe this one would be well made, who knows?
The other thing to bear in mind is that we likely all have our individual ideas on who the main character would be, perhaps based on the kinds of PCs we like to create. I mean, I generally tend towards stealth types and magic users (ideally sorcerers). And, my characters are almost always female.
But...if we go by past movies of this type.. what are the chances we'd see a male, sword wielding "hero?"
Just something I wanted to throw out there, anyway.