Moriarty is supposedly the butler of Dorian Wormwood the retired stage actor. Actually, he is Wormwood in disguise.
He is bald and a bit heavyset.
Scooby-Doo, Where Are You? (DC Comics)
The fact that the name 'Moriarty' is that of Sherlock Holmes' archenemy is no coincidence. All the names were picked for associations with Holmes, as clues.