Based on the RPG Codex Gamescom interview, as a single player you are stuck with a "Chosen One plus sidekicks" model:

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Bubbles: We've had a couple of requests from people who'd like to create their entire party from scratch at the start of the game.

Swen: Yeah, I've heard that quite a few times. In the single player campaign, that's currently not the case. I'm not gonna say “No” - we'll see where we end up with that. But we won't ship it with that option for sure; it would be an enhancement or a modification afterwards. Because I really want people to try out the Origin stories. And if you give [full party creation to them] from the get go, people are perhaps not going to pick the Origin stories; they're going to miss out on all the fun, because they won't realize how deep we went on all of the dialogue options.

Silly Swen ... more than anything I was excited to pick the four Origin characters and have them battle it out with no Chosen One bias.

Instead, based on this
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You may still see the personal stories of the other NPCs unfolding if you play with them in your party, but these stories “might not go very well.”
it looks like your main character will be the anointed hero who ends up fulfilling his story no matter what, and any characters with opposing tags are doomed to get killed off or whatever. Fuckin' weak. The whole reason I was excited about this was so that I could sincerely role-play two opposing points of view and let the dice determine who wins.

Last edited by Zombra; 24/08/16 08:52 PM.