Greanbeard was a crewmember serving aboard the Flying Dutchman under the command of Davy Jones.
Despite his name, he had no visible beard to speak of, though he did have a lattice of green seaweed strewn all over his body. His head was conical with crusty, coral-like green flesh and a pair of round yellow eyes sunk into his slit-shaped eye sockets. Greenbeard had also mussels for teeth. As he had become very plant-like, he didn't need to eat or sleep. Additionally, he seems to have a moderate case of Tourette Syndrome, causing his head to twitch involuntarily to one side or another.