You're not a super special chosen one in Kingmaker either. Just some adventurer who hit a home run. Kinda. The first couple chapters of that game do a lot to express that you're in way over your head. You're still the main character of the story, though.
BG3 wants an ensemble cast instead of a single hero but my custom character ends up feeling like a last minute diversity inclusion who's just there to fill out the poster. As someone pointed out in the BG3 thread Spoiler
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the whole plot can be sidestepped since dying causes the tadpoles to detach and you have Revivify scrolls or hit level 5 soon enough to cast it yourself. The party could round-robin cave each others' heads in, pop the tadpoles out, and be done with it. If so, everyone in the party would still have a motivation to adventure except for the main character, who'd just return to Baldur's Gate and whatever they were doing.