Booboo is one of the three ghosts in the episode "Heat Signature." Booboo has two heads which speak seperately, and often finish each other's sentences. Booboo was in a gang with Marceline in the past. With Wendy and Georgy, Booboo helps Marceline prank Finn and Jake into thinking that they are vampires. Though, unlike Marceline, Booboo with his two ghost friends take it too far and attempt to kill Finn and Jake. Along with Wendy and Georgy, he lives in 25 Blood Drive.
Booboo has two heads. One is on top of the other. He has a simple face, like most characters, but only has one visible tooth.