Hi Five Ghost, also spelled as High-Five Ghost, and nicknamed Hi Fives, HFG, or Fives is a main character in Regular Show. Hi Five Ghost is a ghost who works alongside Mordecai and Rigby as a groundskeeper at The Park. Just like Muscle Man, he loves pranking Mordecai and Rigby, but doesn't take it as seriously. Hi Five Ghost made his first debut as a cameo character in the Pilot. He then made his official appearance in "Just Set Up the Chairs". Hi Five Ghost almost never speaks, but when he does, he is voiced J.G. Quintel;Jeff Bennett voiced Hi Five Ghost in his debut episode, but was replaced by Quintel for every episode afterwards for unknown reasons.