How does the character Leo Herman plays on television differ from the real man in the play, A Thousand Clowns?

Leo Herman, forty-one, is the star of the Chuckles the Chipmunk children's television show on NBC. While he is in character as Chuckles, Leo is wildly cheerful and saccharine, prone to saying things like the play's first sentence: "Goshes and gollygoods, kidderoonies; now what are all us Chippermunkies gonna play first this fine mornin?'" Off camera, he is insecure and depressed. He knows that children do not like him, and he suspects that he is not even funny. He tries too hard; he does not know how to reach people. As he says about himself, he is nothing but "the biggest phony you ever met."