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
At the age of 16, Tolkien met Edith Mary Bratt, who was three years his senior, when he and his brother Hilary moved into the boarding house where she lived in Duchess Road, Edgbaston. According to Humphrey Carpenter,
His guardian, Father Morgan, viewed Edith as the reason for Tolkien's having "muffed" his exams and considered it "altogether unfortunate" that his surrogate son was romantically involved with an older, Protestant woman. He prohibited him from meeting, talking to, or even corresponding with her until he was 21. He obeyed this prohibition to the letter, with one notable early exception, over which Father Morgan threatened to cut short his university career if he did not stop.