>>724151962
I was always one to separate life from fiction and hate it when something wants to be realistic, but there's a difference between realism and grounded in reality.
Say a fictional character shoots lightning bolts from his hand. No problem. Now say that when he does that against an enemy instead of electrifying them it freezes them. Something's wrong there isn't it. Now I'm not saying it's inherently wrong and can never happen in any fictional piece, but a world like that would have to set that up wouldn't it. It'd have to set up the idea that a lightning bolt does that because it goes against what you expect.
However if it DOESN'T do that you expect it to shock the guy, and that's what happens in pretty much every game that has something like that. And it does that because while it's unrealistic through letting people do magic, it's grounded in certain rules cause you'd expect it all to work a certain way.
Deltarune doesn't have any supposed in-universe world building where it makes "non-binary" real. It has monsters, no problem there. But it has humans and humans work a certain way. When devs and writers make their characters "non-binary" in their fictional work filled with magic and monsters it's because they're drawing from the idea that they believe the gender exists in real world too and that it's "representayshun".