You've lost me.I mean the world the characters live in. The one where being "the protagonist" isn't a thing.
You posted:
I don't understand how or why "that character's reality" has nothing to do with "the in-universe reality". Aren't they the same thing?You can put it that way, and the game certainly encourages this, but that doesn't change the fact that it is how that character's reality works, which has nothing to do with the in-universe reality.
And I'm also not sure which game you mean by "the game". When I first read your post I took you to mean RPGing in general; but now I don't know.