Hi Five Ghost

High Five Ghost is a ghost who works alongside Mordecai and Rigby as a groundskeeper at the park.

Appearance
High-Five Ghost ( Or "Fives", as Muscle Man calls him) is a small, pale green ghost. He is semi-transparent as you can see through him, but not completely through. He has basic features, eyes and a mouth, but also has one hand sticking out of his head. He has two other arms which are hidden.

Muscle Man
He and Muscle Man seem to be close friends, since they are always assigned jobs together. When Muscle Man is in a frame, it is to be assumed that "Fives" is along with him. The two are inseparable, just like Mordecai and Rigby.

Other Employees
High-Five Ghost does not seem to communicate with the workers at all. He usually remains silent, but does obey orders.

Times High-Five Ghost Speaks
In Just Set Up The Chairs, Fives (along with Muscle Man) says "YES! Uh!" when they are chosen to pick up The Special Entertaiment.

In Rigby's Body, High-Fives asks Rigby "What are you!?" while working in The Snack Bar with Muscle Man.

In My Mom, Fives is shown saying "OHHH!" with Muscle Man and The Taco Worker, but he is barely heard, and some believe he isn't heard at all. He probably isn't heard because Muscle Man's voice is extremely loud when he shouts/yells.

In Rage Against the TV, he says "Uh huh".

In Benson Be Gone,High-Five Ghost screams in pain as his hand grows back.

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.
 * It is unsure if he's as arrogant as Muscle Man, although he does seem to agree with the insults Muscle Man calls out to Mordecai and Rigby.
 * High-Five Ghost's nickname is Fives when Muscle Man and him flee after Muscle Man thinks that a "bucket with wheels" stole Rigby's voice in the episode Rigby's Body. "C'mon Fives, let's bail!"
 * High-Five Ghost wears spiked brass knuckles when Rigby's consciousness was emptied into the garbage truck.
 * In Rigby's Body, we finally hear him speak when he says to Rigby "What are you?" In the episode Just Set Up The Chairs he can be heard saying "Yes" with Muscle Man, though this is barely heard.
 * High-Five Ghost is almost always smiling.
 * High-Five Ghost only frowns when Pops tried to pay the taxes with lollipops in the episode "Don" and in "Rigby's Body" when Rigby came to the snack bar after losing his body, also he seems scared in "My Mom!" and frowns also in the same episode he waves his two hand warning Mordecai & Rigby.
 * High-Five Ghost is a ghost, but it is not explained who he is the deceased form of.
 * In the episode, "My Mom", High-Five Ghost actually has three arms instead of one located on top of his head. His other two arms are on the sides.
 * High-Five might be a parody of the ghosts on Pac-Man.
 * High-Five's hand on his hand looks like a fork, while his other two hands that come out of the side of him have 5 fingers and actually look like human-hands.
 * In Just Set Up The Chairs, it is the first and only time High-Five smiles without his mouth open.
 * Even though it is shown Fives has two other hands, he often does more stuff with his top hand on his head.
 * It is shown that Muscle Man's Uncle John taught High-Five how to fix the engine in the golf-cart to make it go speeding fast. Though, Muscle Man probably was lying, because Fives high-fived him afterwards. Though it's possible that he was maybe saying it was cool that his Uncle John taught him.
 * It's possible that High-Fives is also hurt when someone says that Muscle Man doesn't say his jokes right.
 * High-Five Ghost is proven to be a great bowler.
 * High-Five Ghost enjoys watching football with Muscle Man.
 * High-Five Ghost holds up the rock sign many times.
 * High-Five Ghost likes to annoy Benson.
 * High-Five Ghost is a fan of Fist Pump.
 * In Death Punchies it's unknown why Rigby punches him and he is not shown to have beaten Rigby at Punchies. Also he is shown to be hit but he is not shown with Muscle Man smashed into the building.
 * Fives, Muscle Man, Taco Guy, Mordecai, and Rigby all say "Ooooooooooooooooooooooooooooooohhhhhhhhhhhhhhhhhhh" a lot.
 * When High-Five shout "OOOOOHHHH!" with Muscle Man and Taco Shop Worker, he is not heard.
 * High Five Ghost has many nicknames, including High-Five, High-Fives, Fives, HFG, and Five.
 * In the episode Benson Be Gone, Mordecai, Rigby, Pops, Skips, Muscle Man, & High-Five Ghost all turn into Susan and the only way to change back is to slack off Mordecai, Rigby, & Pops play video games. Skips plays solitare. Muscle Man doesn't do what Susan says and his hair grows back to the way it was he then swings this shirt turning him completely back. High-Five Ghost also doesn't do what Susan says and very painfuly his hand grows back and his body comes back but his body is more of a head for Susans body and then drinks a can of soda and is back.
 * It is possable that the way High-Five Ghost looks in Benson Be Gone is a reference to the killer in the horror movie Scream.
 * High-Fives Ghost also resembles one of the ghosts from the game "Pacman."