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).
J. R. R. Tolkien
In a 1951 letter to Milton Waldman, Tolkien wrote about his intentions to create a "body of more or less connected legend", of which "[t]he cycles should be linked to a majestic whole, and yet leave scope for other minds and hands, wielding paint and music and drama". The hands and minds of many artists have indeed been inspired by Tolkien's legends. Personally known to him were Pauline Baynes (Tolkien's favourite illustrator of "The Adventures of Tom Bombadil" and "Farmer Giles of Ham") and Donald Swann (who set the music to "The Road Goes Ever On"). Queen Margrethe II of Denmark created illustrations to "The Lord of the Rings" in the early 1970s. She sent them to Tolkien, who was struck by the similarity they bore in style to his own drawings.