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).
Roger Lancelyn Green
Roger Gilbert Lancelyn Green (2 November 1918 – 8 October 1987) was a British biographer and children's writer. He was an Oxford academic who formed part of the Inklings literary discussion group along with C. S. Lewis and J. R. R. Tolkien.