TYPE: Ghost, Undead.
AFFILIATIONS: Koopa Troop.
SKILLS AND ATTACKS: Fast and can power-up foes.
STRENGTHS: Fast and can possess.
BACKGROUND: Ghoul Guys are the results of dead Shy Guys. They are the ghost of a leader Shy Guy. That is why they are more powerful than Boo Guys. They haunt Shroob Castle in the past.