Chancy Roberts was a treasure hunter.
Physical appearance[]
Chancy is an adult man with brown hair and a goatee beard. He is only seen wearing his ghost costume.
Personality[]
He was a greedy man, he wanted to get pirate treasure all for himself.
History[]
Solve It with Scooby-Doo!: Math[]

Chancy unmasked.
He knew about pirate treasure buried underneath the Crystal Cove Fair, so he dressed up as a ghost to scare everyone away so he could find it and get filthy rich.
His plan was soon foiled when Rita, a friend of the gang, called them over to help with the fair, they built a trap and caught him and he was taken away from the police soon after.