I would limit it to a very small number of non-humans, otherwise you end up with a bunch of vampires and hybrids. It would be more fun to have only 1-2 of them; example: Hellboy and Abe Sapien. (Perhaps one "mythical being" and other extraterrestrial sentient)

My plan is to be your regular Jane Doe persona, little bit crazy, organizing her own searches and investigations regarding paranormal and unknown. Perhaps way too active in supporting conspiracies and weird coincidences.

It would be definitely good to have something on governmental level like X-files, but not all of it. It would kill the whole fun, especially with the Liberty competence. Let´s say there would be official investigators and bunch of people inspired by Scooby Doo gang ;D

And The Mothman is one of my favourites! So it would be nice ho have him here.