I believe every player character is considered a Baldurian and they get automatic dialogue queues and checks for history, unless they are a Lolth-sworn Drow or a Githyanki. For those, you get racial options and non-Baldurian options.
It's part of the way for Larian to give a similar degree of depth to the created characters, like the origin characters/companions. Addressing a common complaint from DOS2 where the PC felt like they were only along for the ride.
