@Pandora Well, I’m afraid we can’t really discuss fairy tales here, while it’s true that they may be a little similar in that they are both works of fiction, there’s not much else to attest for that. And I just took the idea for this thread from Higurashi and Umineko’s folklore, I didn’t mean for this to be a thread where we discuss inspirations for Umineko, there is another one for that I believe, around here. You can always create a thread of your own about fairy tales though. 
@Restkastel Well @Doldod put it very well where they differ, and that is in that mythology is more epic and involves a larger scope of the world while folklore is more about mysterious little happenings and encounters. While I prefer mythology over folklore, I really like this aspect of it, being described as something mysterious that’s happened somewhere, that makes the inhabitants of that place whisper to one another about it and it eventually turns into a folktale. It also, like Doldod said, gives the human world some power in the tale, about you know, how to fight these creatures and such.