In Rainbow Rowell's Fangirl, Cath is a Simon Snow fan. Okay, the whole world is a Simon Snow fan, but for Cath, being a fan is her life--and she's really good at it. She and her twin sister, Wren, ensconced themselves in the Simon Snow series when they were just kids; it's what got them through their mother leaving.
"I bought the milk," said my father. "I walked out of the corner shop, and heard a noise like this: T h u m m t h u m m. I looked up and saw a huge silver disc hovering in the air above Marshall Road."