Uber-fan

Now, even though I am a self-professed Harry Potter uber-fan, I have found myself spending less and less time on Pottermore.

Source: wiktionary

Drawing a wild bunch of uber-fans to journey up a winding, moonlit road to Pappy & Harriet's, the far-out roadhouse at the edge of cellphone coverage, the quartet performed one of its typically rambunctious shows.

Source: wiktionary

Ray Perez is the Raiders uber-fan who dresses up for games Black Hole style and goes by the alter ego of Dr. Death.

Source: wiktionary