William Todd Williams was the author of the Blade Quest books.
He'd written 29 Blade Quest books, which were very popular, and had given his money to build an orphanage in the Himalayas.
William comes to St Hearts to release the thirtieth and final Blade Quest book. However, Luke Blade (the hero) is at the end killed by the Dark Wizard (the villain). It is part of William's plan to ruin the planet, as he build the orphanage in the Himalayas as a mountain top retreat. He is defeated by the MI High team.