Tolkien, the author of the Lord of the Rings.

Gollum, the one ring, the one ring to rule them all. Gollum and the One Ring share one of the most tragic and deeply intertwined relationships in J.R.R. Tolkien’s Middle-earth lore. Originally a Hobbit-like creature named Sméagol, he was instantly corrupted by the Ring's malice, murdering his cousin Déagol to claim it as his "Precious".

Need to read!

Cthulhu! Cthulhu is a fictional cosmic entity created by writer H. P. Lovecraft.

Muggles! Likely referring to Harry Potter. Could also be a name.