Low Five Ghost

Low-Five Ghost appears in See You There. He is High-Five Ghost's brother (possibly older brother) and has the exact appearance as him but with facial hair and sun glasses (the sunglasses are not part of his costume since he was wearing them when he was bailed out of jail). He was part of Muscle Man's prank to get revenge on Mordecai and Rigby for spilling soda on him as Muscle Man and High Five Ghost bailed him out of jail to turn Mordecai and Rigby into ghosts. It is unknown why he was in jail, but it might have been because of turning people into ghosts.

Trivia

 * Low-Five is shown to use his two other arms on the sides more frequently than his brother and his father.
 * Low-Five has the ability to make his hand on his head disappear and replace them with the hands on his side; this is also possible with his bottom.
 * Low-Five has been nicknamed "Low-Fives" by Muscle Man, which is the equivelent of High-Five being nicknamed "High-Fives".
 * Low-Five may be in jail due to turning people into ghosts which has caused problems.
 * Low-Five appears to be older than High-Five Ghost.
 * Low-Five Ghost is the fourth family member to appear; the first was Don, the second is Mr. Maellard, and the third is John.
 * Despite his name, Low-Five keeps his hand on top of his head by default like High-Five
 * He may like soda because he threw an empty can on the ground.
 * He thought Mordecai and Rigby were wearing costumes as a blue jay and a raccoon.
 * The sunglasses that Low-Five Ghost wears is nearly identical to the pair that The Night Owl wears.
 * He can also change people from ghost to normal.