The Fool is a member of the Vampire King's court in the Adventure Time miniseries "Stakes".
The Fool was staked by Marceline Abadeer to protect the last remaining humans. He is the first vampire Marceline encountered. He used to have two teeth until he lost one to a box turtle. Marceline encountered him in a van and easily defeated him, sucked his soul and gained his power of levitation. He claimed Marceline's hunt for the vampires was a game of hide and seek
He returned after Princess Bubblegum drained Marceline's vampire essence. He was happy to be alive again and have two teeth in his mouth again. But the Vampire King grabbed him and sucked out one of them, telling him to get used to a new life. He stayed with him while the other went different ways. When Marceline Started to look for the vampires again, she followed the scent to a chamber and finds booth the Fool and the Vampire King. When she rejects the King's "friendship" she grabs the Fool and squeezes him until he dies and suckes his soul, regaining his power of levitation. He shrugs of being stabbed in his usual carefree fashion.