Bogel is on the left
Bogel is one of the two ghosts who wanted to trick a mortal into opening the Chest of Demons.
He is a bit funnier than Weerd because he causes most of the problems of the twosome. He was first seen taking a shower.
The two ghosts tricked Shaggy and Scooby into opening the Chest of Demons. In subsequent episodes they serve as incompetent henchmen to that episode's monsters.