Only the Origin characters are going to have interaction with the world and Custom characters are not going to be as important.
They've stated the exact opposite of this statement. From the Reddit AMA:
Are there plans to make custom characters feel as unique as the origin ones? If so, what can you tell us about them?Adam: Hello! I’m not Swen, I’m Adam, one of the Senior Writers on BG 3
. Custom characters are hugely important to us, and when you choose your class, race and background, you’ll already have made choices that have an impact throughout the game - both in terms of what you can do, how you’re perceived, and what you know. But just as in tabletop, it’s what you do after character creation and how you choose to roleplay that character that will make your adventure and character unique. In many ways, they’re more unique, because you made them.
The world and the characters that populate it - whether companions, NPCs, enemies or potential allies - will remember and react to your actions and attitude. Custom characters are central to the arc of BG3, and as your journey unfolds, you’ll walk your own path. And when your story ends, you’ll have determined your own fate… and the fate of many others.
I think the concern here is that people felt that playing DOS2 as non-origin characters was somewhat pointless because they would miss out on quite a few dialogue options, and would have substantially less storyline. This was especially true if you were playing co-op, because each person who made a custom decreased how much you could interact with even companion stories. Will there be more storyline for customs than what was seen in DOS2? Perhaps something akin to Dragon Age Origins origin characters?Adam: This isn’t DOS2. In BG3, custom characters have a much stronger connection to the world and the main arc of the story - whether they’re from Baldur’s Gate, further afield, or somewhere else entirely (hey, githyanki). The campaign is much more reactive to your actions - when we say there are serious consequences to your choices, we really mean it - and as you move through your adventure, you’ll discover quest-lines and stories that relate directly to the character you’re roleplaying, and the things that you’ve done. We’re confident that you won’t feel short-changed in terms of narrative breadth and depth if you choose to play as a custom character- we love our origins, but this campaign is built for all of you.
