This makes no sense for BG3. Your whole journey in the game is based on your character, whether it’s a custom character or one of the optional companions (btw, Minsc is an NPC, not a companion). Decisions you make throughout the game affect later interactions and options and are tied to very specific choices and factions.
Let alone that summary implies that you should be able to play story elements way outside of the scope of the current game itself. How many full fledged and unique story lines in a 3d worlds with its own NPCs, dialogue, and choices are we expecting here? Sure, let’s create massive backstory elements for each companion, which could be 10-15 hours long?
Seems like an extreme ask and, at the least, a bit ridiculous.

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