Wow this is a pretty cool idea but I wonder kind of quest it could be to compare to origin characters
It could be one of your choosing! Tyranny, an RPG made a while back, had a bunch of novelties going for it, amongst it, they let you create the backstory of your character. And the way they did it was really cool too, the setting of the game is a brutal war against the last remaining nation to resist, and in that creation of your story, you as a sort of general, choose where to attack, who to send, get a choice between negotiation or slaughter, and all these choices would not only affect the people and how they view you, it would also completely change some of the lands that you will visit during your travels.
We could surely do something similar in Baldurs gate, have our character walk through his stages of life with it's various conflicts, and that'll shape the nature and direction of the personal backstory.
The only issue I see here is, that we're starting at level 1, and you can't really take it seriously if your level 1 fighter fought terrible demons and discovered a mysterious artefact of great power that they must unlock and understand. But tbh, that seems to be a general problem with all of our origin characters, so we wouldn't really be all that out of place.
