Elwin Ransom
Elwin Ransom may be based on C. S. Lewis' friend J. R. R. Tolkien ("Elwin" means "Elf friend" in Anglo-Saxon), though he seems to have autobiographical elements. In "That Hideous Strength" Ransom, with his royal charisma and matter-of-fact breezy acceptance of the supernatural, appears less like Tolkien than like Charles Williams (or some of the heroes in Williams' books).
Tolkien fandom
A Tolkienist is someone who studies the work of J. R. R. Tolkien: this usually refers to students of the Elvish languages and "Tolkienology". The term Ringer refers to a fan of "The Lord of the Rings" in general, and of Peter Jackson's live-action film trilogy in particular. Other terms describing Tolkien fans include Tolkienite or Tolkiendil.