Muscle Man

Mitch "Muscle Man" Sorenstein is one of the groundskeepers at the park

Appearance
Muscle Man is a green, obese man with shoulder-length dark brown hair. he wears a long-sleeved grayish-blue shirt, dark gray pants, and black shoes..

Personality and Traits
Muscle Man is a type of monster and/or disfigured humanoid that works in the park along with Mordecai and Rigby. Although Benson considers him to be hard-working, Muscle Man (along with High Five Ghost) has been revealed to do more work than Mordecai and Rigby dispite all 4 being slackers. In Muscle Woman, though they tend to slack off more than Mordecai and Rigby. In My Mom, it's shown that he has a lot of friends, most in which love his constant "My Mom!" jokes, which everyone else at the park gets annoyed with. He's best friends with High Five Ghost, who loves his jokes. Ignorant yet clever when it comes to pranks, he's always either insulting Mordecai or Rigby, or trying to prank them (ex. "My Mom", "See You There"). But he does care about his mom as shown in My Mom when he got very angry when Mordecai and Rigby made fun of his mom. In response, he brought his brother, John, to give Mordecai and Rigby a punishment for ridiculing their mother.

Despite being obese and lazy, there is a story behind Muscle Man's nickname (as revealed in Peeps). In the episode, he said that he is losing muscle mass from the stress Peeps put on him, so he may have muscle mass. In In the House when his skin was ripped off, it shows that Muscle Man does have muscle mass as he flexes his arm and says," I told you I was ripped" before he dies.

Cartoon Network Character Page Description
"Muscle Man is a macho jerk who's always putting people down. However, he usually messes up the wording of his insults and winds up making fun of himself."

Starla
Starla is Muscle Man's girlfriend that is seen in Muscle Woman. Prior to the episode, Muscle Man has been dumped by Starla 2 times, presumably for not sharing his feelings with her.

High-Five Ghost
High-Five Ghost is to Muscle Man as Rigby is to Mordecai, but because we don't see them together as much, we can't be sure. Mordecai shows affection for Rigby much more than Muscle Man does to HFG. They are usually seen together in the episodes. He usually gives a high five right after Muscle Man says a "My Mom" joke. In "My Mom!" the two seem to slack-off as much as Mordecai and Rigby. In Jinx Muscle Man is seen punching HFG.

Mordecai
Out of the two protagonists, Mordecai seems to dislike Muscle Man more. He is annoyed by the constant "My Mom" jokes and even confronts Muscle Man about it in "My Mom!". Besides that episode, there is not much interaction. Muscle Man does throw his shirt at Mordecai in Caffeinated Concert Tickets, but that may have been an accident rather than a direct confrontation. He may have been doing this just so that they would not have to do his work.

Rigby
Rigby seems to like Muscle Man slightly more than Mordecai. He likes to hang out with him in My Mom! and seems to get along with him very well, yelling "Ohhhhhh!" along with him at the taco truck. They do have some confrontations though. In "Meat Your Maker", he goes to say Muscle Man pushed him at a party (though Mordecai quickly says Muscle Man was not even there). Also by the end of "My Mom", Rigby goes on to say how he hates Muscle Man. Also in "Death Punchies", Muscle Man is forced to be look out, even though his eyes were punched out by Rigby. They also hang out in "The Night Owl".

Benson
Benson trusts Muscle Man far more than Rigby and Mordecai, as established in "Appreciation Day" and "My Mom ". He does fire Muscle Man though in "Don", but this may be due to the stressful situation that everyone was in. Benson also seems to understand Muscle Man and his antics, as demonstrated in "But I Have A Receipt" and "Free Cake", not yelling at Muscle Man when he put "My Mom" on the list. He does not confront Muscle Man when he unzips his pants in "Free Cake ", saying, " It's not that kind of party, Muscle Man."

John
John is Muscle Man's big brother, who was seen in "My Mom". He and Muscle Man almost look alike except John is taller and doesn't have green skin but both of them are obese.

Scott D.
Scott D. is the person in charge of the getting people to the Crash Pit. When Muscle Man and High Five Ghost find a car to run into the Crash Pit he gets people to watch.

Bobby
Bobby works at the nursery he helps people carry heavy plants. Him and Muscle Man are freinds. He thinks Muscle Man's "My Mom" jokes are hilarious.

Jimmy
Jimmy works at the TV Warehouse and owes Muscle Man something. He got fired for giving him a TV so that they can beat the hammer.

Other Characters
There is minimal to no interaction between Muscle Man and Skips and Pops, and many other characters.

Trivia

 * In the episode Muscle Woman, his real name is revealed to be Mitch Sorenstein.
 * In the same episode, Mordecai refers to Muscle Man as a "human", even though he does not resemble one
 * Muscle Man also appears to be drawn similarly to characters from "The Marvelous Misadventures of Flapjack", a Cartoon Network cartoon J.G. Quintel worked on before starting Regular Show.
 * More often than not, Muscle Man removes his shirt during the episode he appears in.
 * Despite having a high school education, Muscle Man doesn't know how many days are in a year
 * Muscle Man's "My Mom" jokes are similar to "Your Mom" jokes, but Muscle Man words the jokes so they insult himself rather than others, which is the intention of "Your Mom" jokes
 * Muscle Man's voice tone turned lower after Caffeinated Concert Tickets.
 * Muscles Man's catchphrase for getting hurt is "Oh no, bro.", which is seen in Death Punchies, Rage Against the TV, and Slam Dunk
 * In Over The Top, Muscle Man lasted the longest in the arm wrestling match against Skips.
 * He thinks an internet sensation called Wedgie Ninja is funny.
 * Muscle Man often goes beserk when he is injured/hurt (ex. See You There, Over The Top , Karaoke Video , Death Metal Crash Pit )
 * Even though Muscle Man was fired in "Don" he still works at the park in the next episode.
 * Muscle Man resembles Yajrobe from Dragon Ball Z with his voice, body shape and attitude
 * Muscle Mans shown/known family is similar to Al Borlands family on Home Improvement, both have brothers that look similar to them, and both have unseen moms.
 * Throughout at least the second season, there is reference to Muscle Man having some sort of odor. In The Night Owl, Mordecai says that he smells like barf, but this is never again touched upon.
 * In almost every episode he appears in after "Terror Tales of the Park" he makes a pig-like squeal.
 * He seem to suffer from some form of Technophobia.