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 1941 letter to his son Michael, Tolkien recalled:
On the evening of his 21st birthday, Tolkien wrote to Edith, who was living with family friend C. H. Jessop at Cheltenham. He declared that he had never ceased to love her, and asked her to marry him. Edith replied that she had already accepted the proposal of George Field, the brother of one of her closest schoolfriends. But Edith said she had agreed to marry Field only because she felt "on the shelf" and had begun to doubt that Tolkien still cared for her. She explained that, because of Tolkien's letter, everything had changed.