Wiktionary
n. A fictional character whose name or a short description is present in the title of the work where the character appears.
Usage examples of "title character".
Mike Myers, the actor, who had dubbed the voice of the title character in Shrek, to tell him that Shrek absolutely, no doubt about it, rocked.
For instance, the basic idea for my novel Speaker for the Dead was going nowhere until I realized that my title character had to be the main character from another story, Ender's Game.
He thought of Oblomov for a moment, remembering the time in college when he had read the book and had been so smitten by it that, like the title character, he had decided to stay in bed, permanently.
He illustrated an expensive edition of Hiawatha one time, and the model he used for the title character was the son of a Greek fry cook.
In Michael in the 'Fifties, an unpublished novel by Kleo Mini (Dick's second wife, to whom he was married for most of the fifties decade), the psychological makeup of the title character is based loosely on Dick and displays the same intense scrutiny of existence that Mini remembers in her husband at the very start of his SF writing career.