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).
Owen Barfield
Barfield and C. S. Lewis met in 1919 as students at Oxford University and were close friends for 44 years. "It is no exaggeration to say that his friendship with Barfield was one of the most important in his [Lewis's] life…” The relationship was reciprocated. Almost a year after Lewis's death, Barfield spoke of his friendship in a talk in the USA: "Now, whatever he was, and as you know, he was a great many things, CS Lewis was for me, first and foremost, the absolutely unforgettable friend, the friend with whom I was in close touch for over 40 years, the friend you might come to regard hardly as another human being, but almost as a part of the furniture of my existence.” When they met, Lewis was an atheist who told Barfield, "I don’t accept God!" Barfield was influential in converting Lewis. Lewis developed the concept of two kinds of friends, a first friend with whom you feel at home and agree and a second friend who brings to you a different point of view. He found Barfield's contribution in this way particularly helpful despite, or because of, the fact that “during the 1920s, the two were to engage in a long dispute over Barfield's (and their mutual friend, A.C. Harwood's) connection to anthroposophy and the kind of knowledge that imagination can give us… which they affectionately called 'The Great War'. Through their conversations, Lewis gave up materialist realism – the idea that our sensible world is self-explanatory and is all that there is – and moved closer to what he had always disparagingly referred to as “supernaturalism.” These conversations influenced Lewis towards writing his Narnia series. As well as being friend and teacher to Lewis, Barfield was (professionally) his legal adviser and trustee.