Stinky Williams is a minor character in the online book. As Greg says, he lives up to his nickname - according to Greg his sweat smells like rotten eggs. When Greg's gym class did a unit on wrestling, Stinky was the only other boy in Greg's weight class in the class, and so they always wrestled each other. Stinky won all their matches easily, while Greg claimed it was partly because Stinky was super-humanly strong, and partly because he didn't want to touch him. Greg says that he does not know why he smells the way he is.