There probably is none besides the "Baldurian" tag from what I heard, but even then, what does that give? You are from Baldur's Gate... great, that's like probably 90% of characters here. Not even the Dream Waifu or "guardian" is exclusive to you now, from what I saw TDU gets them too.
Yeah... This is DOS2 all over again. If you choose TAV you are gimping yourself. Plain and simple.
You were gimping yourself in DOS2 because the party was locked after first chapter. So you could only see 3 origin character stories played out instead of 4. If we can keep all companions throughout the game, I don’t see any downside in having your own custom character and we get all companions’voice acting.