Potterhead

noun1

1. •
   (informal, slang) One who loves the Harry Potter series of books, the Potterverse, and/or the Wizarding World Rowling-created franchise, especially to a fanatical degree.

   • Her infectious enthusiasm has brought many knitters (like Alison Hansel!) into the Potterhead fold and has introduced Potterheads into the world of knitting. — 2007