Quote Originally Posted by Yora View Post
But I have played lots of games in which there was no alignment and there are still demons. I've seen lots of movies and novels with the same thing. Does not make sense to you, but it exists and good game design shouldn't only have the solution "then don't play it".
Such cases would of course require more homebrew. But they also necessarily imply different things about demons (what is the "essence" of being a demon, if alignment does not exist), so new homebrew is desired anyway.

"Standard" D&D is designed for a particular type of campaign setting; the more you diverge from that, the more homebrew is required to model the changes.