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).
Edith Tolkien
Edith Mary Tolkien (21 January 1889 – 29 November 1971; "née" Bratt) was the wife and muse of novelist J. R. R. Tolkien, and the inspiration for his fictional characters Lúthien Tinúviel and Arwen Evenstar.