Hi Five Ghost

High Five Ghost is ghost who works alongside Mordecai and Rigby as a groundskeeper at the park. He and Muscle Man seem to be close friends, since they are always assigned jobs together. Strangely, High Five Ghost does not speak as much as the other characters, although when he does, he has a rather high-pitched, wavering voice. His name is evident because he has what looks like a hand on his head and often high-fives Muscle Man with it.

Trivia

 * Despite his name, High Five Ghost is shown to only have four fingers.
 * He and Muscle Man can be seen with the crowd of people on the Pilot watching Mordecai and Rigby playing Rock,Paper,Scissors.
 * When Muscle Man is fired in "Don", High Five Ghost goes with Muscle Man, even though High Five is not fired...
 * High Five's nickname is Fives when MM and him flee after MM thinks that a "bucket with wheels" stole Rigby's voice in the episode Rigby's Body.- "C'mon Fives, let's bail!"
 * High Five has a spiked glove that looks like a paw when Rigby's conciousness was emptied into the garbage truck.
 * We finally here him say actual words when he says to Rigby "What are youu?"