Je suis le grand Muzzi-- I am the great Muzzy!! everybody knew Muzzy growing up :) also you're correct, but conceivably there's a situation where one might say

Je suis le grand Muzzi-- I am the great Muzzy!! everybody knew Muzzy growing up :) also you're correct, but conceivably there's a situation where one might say, "je suis la jeune fille avec qui tu parlais hier soir"