@malte To be clear, I'm not saying you can't restrict the definition of "real" like that, and I'm not trying to conflate imaginary and physical existence or say that everything is real in the same way. I'm just saying I find it useful and delightful to define multiple ways of being real.
What is your preferred word for narratives or ideas that affect the world? E.g., race has no biological basis but it is _____.