If I understand the tale correctly, the main characture in Hidious Strenght is Tolkein himself (Name changed of course). Lewis and Tolkien had a deal, one would write a Sci-Fi and the other a Ghost story, and find which would be more popular. Tolkien's ghost story lost, but, it did have Lewis as the protagonist (name changed of course)
Ransom is a linguist, and I could see other similarities to Tolkein as well.
I love the character, but I thought he was better in the first two.