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).
The Well at the World's End
Although the novel is relatively obscure by today's standards, it has had a significant influence on many notable fantasy authors. C. S. Lewis and J. R. R. Tolkien both seem to have found inspiration in "The Well at the World's End": ancient tables of stone, "King Gandolf," a "King Peter," and a quick, white horse named "Silverfax," an obvious inspiration for "Shadowfax," are only a few. Lewis was sufficiently enamored with Morris that he wrote an essay on that author, first read to an undergraduate society at Oxford University called the Martlets and later published in the collection of essays called "Rehabilitations".