Georgy

Georgy is a ghost that first appears in "Heat Signature". He is friends with Marceline, along with Wendy and Booboo. He helps them prank Finn and Jake, and takes it too far, almost killing the mortals, showing his cruel and mean personality.

Appearance
He has the most traditional look of a ghost sported by any of those seen in "Heat Signature". He very much resembles a Pac-man ghost.