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).
Tony Marchington
While at Oxford, Marchington befriended and later lodged with American Walter Hooper, the last personal secretary of the writer C.S. Lewis. Through this relationship, Marchington: shared a lectern with Hooper in 1975 in North Carolina; co-wrote the script of "Through Joy and Beyond," the 1977 documentary life of Lewis; and created the Lewis bonfire hoax letter, sent to Christianity and Literature in 1978.