I'm a librarian who loves anime, manga, and reading a wide variety of genres.
The original post is here.
I really had to dig to think of an "F" character I remembered and/or liked enough to call a favorite. I settled on Foaly from Eoin Colfer's Artemis Fowl books. Yes, he literally wears a tinfoil hat, but he's also a brilliant centaur who's invented lots of amazing and useful things for the LEP (Lower Elements Police).