|Coach R. Russo
Coach Russo is a giant red cube with a white shirt, teal athletic pants, and blue hair. She does not have a neck; her head is directly attached to her legs. Her nose is a red ball, and her ears are located on both sides of her head.
Coach seems to be lazy. Although she claims she has already won the gold medals of many Elmore Olympic Games, she does not seem to be very skilled in gymnastics, and gets tired easily. She also appears to be very proud of her daughter, Jamie, because Coach believes she is the best and most athletic student in her class. She is also a glutton, as seen in "The Scam."
- "The Coach": This is her first appearance and major role in the series. She is the new coach at Elmore Junior High.
- "The Joy": She gets infected with the Joy virus and chases Miss Simian down the school hallway.
- "The Recipe": She teaches swimming class.
- "The Name": She is seen talking to Juke.
- "The Fraud": Principal Brown tells her he is going to blow up the school.
- "The Bros": She is seen coaching a basketball match.
- "The Question": She tells Gumball and Darwin her opinion on the meaning of life.
- "The Safety": She appears on one of Darwin's security monitors.
- "The Society": She is in the gym.
- "The Triangle": She appears eating a banana, while being startled by the band.
- "The Upgrade": She is coaching gymnastics.
- "The Girlfriend": She is teaching gym.
- "The Advice": She seen pounding her head on the wall of the teachers' lounge and is later among the chaos caused by Gumball and Darwin.
- "The Parasite": She is in the gym when Gumball tries to hit Jodie.
- "The Slap": She appears at the gym.
- "The Compilation": She hosts an exercise video entitled "4 Steps to Get in Shape."
- "The Scam": Carrie possesses her, and Gumball and Darwin vacuum garbage and a cow from her stomach.
- "The Stories": She is coaching dodgeball.
- "The Ollie": Gumball skates on her head.
- "The Sorcerer": She is at the stadium with her class.
- "The Lady": She eats one of the candles Mr. Small left out, mistaking it for candy, and starts having an existential crisis and hallucinating.
- "The Anybody": She accidentally stops Gumball from getting into class.
- "The Agent": She is in swim club.
- "The Decisions": Banana Barbara flies into her mouth.
- "The Inquisition": She is at the meeting.
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- Unlike most stereotypical gym teachers, Coach is overweight and un-athletic. For example, while she was chasing Miss Simian as a Joy zombie in "The Joy," she had to stop every few steps to catch her breath.
- A running gag in several episodes is that whenever she attempts to whistle, she fails miserably, and spews saliva at students in the process.
- Despite being un-athletic, Coach has won three gold medals in trampolining.
- Coach also won the 1986 Olympics in Elmore.
- In actuality, there was no 1986 Olympics, meaning Coach might have lied about her winning the Olympics, or they may have happened in the show's universe.
- Before she took up the position in "The Coach," Miss Simian and Mr. Small were shown to be the PE instructors.
- Coach is also the coach of the basketball team Elmore Ducks.
- Gumball and Darwin thought she was a man in "The Coach."
- Coach is one of the few female characters to be voiced by a male. The others are Miss Simian, Sussie (before season 5), Tina, Bexi, and the dolphin woman.
- Her voice is similar to that of Roz, a character in the Disney/Pixar movie Monsters, Inc.
- She reveals her last name in "The Compilation."
- The initial of her first name, "R," was revealed in "The Agent."