I love books that might exist in a fictional world. Like there is a book called “Pokénatomy”. It’s all about the hypothetical anatomy of Pokemon, but it reads like a real textbook.
Another example is Star Wars’ “The Jedi Path”, which is a guide book on the Jedi code, and how Jedi should behave.
Not sure what kind of genre these books are, but I would love to find more!
by chexxiemixie