The Graveyard Ghoul was the disguise of Count Evallo von Meanskrieg.
Scooby-Doo! Mystery Incorporated
He tried to scare the Bjorklunds and everyone else away from the cemetary so that he could steal natural gas. Velma first suspected him because he acted like the Ghoul even out of costume. At some point prior to working in the cemetery he was denied a work permit for being "pure evil". While Evallo was arrested by Sheriff Bronson Stone for being the Graveyard Ghoul, he was released due to his family's diplomatic influence.