Llewellyn Sinclair, the musical director of Oh! Streetcar!. His sister, Ms. Sinclair, runs the Ayn Rand School for Tots.

Llewellyn is short-tempered and a perfectionist. Originally, Marge is turned down for the part of Blanche, but after seeing how sad she really is, he realizes she's perfect. He insinuates that he once reduced a class of fourth graders to tears but got a decent review. In the musical, he plays Pablo, which was originally played by Otto but Otto "didn't work out". In the end, the musical is a success, which Llewelyn takes all the credit for.

He also took part in a record attempt for the world's tallest human pyramid.

Later, he decides to give up his job and becomes a waiter.