Pervy Catgirl Fancier
You know, you could make a pretty good parallel here with the Touhou universe, which is almost completely fanon. I suspect most people following all the little cute flash videos dont even realise there's a game at the root of it all. What really gets me is how CONSISTANT this fanon stuff can be.It manifested worst in '90s anime fandom, where the canon was often extremely difficult to get a hold of. Nowadays, of course, that particular problem has been nuked, but you still get writers who only know it through other fanfics.
It makes me ponder if this is how mythologies get started. Are they both rooted in the same psychological niche?