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.
There is at least one non 'Baldurian' background: Outlander is for sure one, I used for a ranger in EA at one point, and he made a point of it a couple times. At least once with Astarian and I think with the Wannabe wizard Tiefling. If they reinstate hermit, I'm sure that will be non-baldurian as well.
I just realized that wasn't really your point.
To me it seems like the flag: 'Not a murderous monster' is a nice tag to have for most playthroughs.
