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).
Mythopoeic Society
The Mythopoeic Society (MythSoc) is a non-profit organization devoted to the study of mythopoeic literature, particularly the works of J. R. R. Tolkien, Charles Williams, and C. S. Lewis, all members of The Inklings, an informal group of writers who met weekly in C.S. Lewis’ rooms at Magdalen College, Oxford, from the early 1930s through late 1949.