It's no wonder why works of science fiction, fantasy and horror feature writers as main characters—people like to imagine themselves as heroes; why shouldn't writers do the same? And tucked away inside those books by writers like J.K. Rowling and Stephen King lies a veritable treasure trove of tomes that don't exist, but should.
To be clear, we know that shows like Buffy the Vampire Slayer and movies like Ghostbusters are littered with reference guides and texts to the supernatural. I don't know about you, but textbooks don't often make for fun reads, so we've left most of them off of this list. (Our apologies, Necronomicon!)
Here are some hopefully worthwhile additions to your own Library Imaginarica.