Master William Gracey is a character in the comics, based on the Aging Man and the Ghost Host from the attraction, as well as the Captain Gore character from Ken Anderson's early concepts. His name was taken from the Master Gracey tombstone (honoring Imagineer Yale Gracey).
William Gracey is the ghostly master of Gracey Manor. In life, he was secretly a pirate known as Captain Blood. He fell in love with a beautiful young woman named Emily de Claire, and three years after she died, he hanged himself.