Emperor-Beyond-The-Sea

Never appearing, and rarely being mentioned, the Emperor-Over-The-Sea is, according to folklore, the father of Aslan, whose divinity was present before the creation of Narnia (and probably all worlds). Presumably, he created The Deep Magic that govern Narnia and is the God above all gods.

Trivia

 * The Emperor-Over-The-Sea is said to represent God the Father. In turn, God is the father of Jesus Christ, whom Aslan is said to represent.
 * The Emperor is only mentioned in The Lion, the Witch and the Wardrobe, Prince Caspian, and The Horse and His Boy. In later novels, his attributes are embodied in Aslan. Whether or not this change was deliberate on Lewis' part, his status is unclear by the end of The Last Battle.
 * The Emperor-Over-The-Sea is yet to be mentioned in any film adaptations.