Who is Schitt-Hawse from Thursday Next in Lost in a Good Book: A Novel and what is their importance?

Schitt-Hawse works at Goliath Corporation, and his half-brother is stuck in Poe's 'The Raven.' With the help of a group of his friends, Schitt-Hawse tricks Thursday into rescuing Jack Schitt, his half-brother, and then refuses to reactualize Landen.