- Colin and Felix
- Banana Joe
- Hot Dog Guy
- "The Club": Gumball looks for the football club.
- "The Meddler": Nicole can be seen bathing Gumball against his will.
- "The Skull": Gumball, Darwin, and Clayton try to avoid taking a shower, and end up destroying it in the process.
- "The Sidekick": It is one of the many places where Tobias apologizes for not returning Gumball and Darwin's game.
- "The Photo": Gumball trains his face for his school photo.
- "The Voice": Gumball and Darwin falsely apologize to Tobias. It later reappears when they fight William.
- "The Move": Clayton is seen taking a shower here.
- "The Bros": The cheerleading squad is seen here.
- "The Society": Tobias checks his weight on the scale here.
- "The Triangle": The school marching band is seen inside here.
- "The Pest": It is one of the places where Gumball and Darwin advise Anais.
- "The Hug": Hot Dog Guy showers here.
- "The Guy": Gumball takes pictures of Josh showering.
- "The Vision": Gumball and Darwin find Alan's gym bag here.
- "The Worst": Gumball and Darwin get harassed in here.
- "The One": Tobias insults Gumball here.
- "The Cringe": Gumball, Hot Dog Guy, and Banana Joe have an interesting shower party experience here.
- The school showering stalls have been destroyed twice in the series so far. The first time was in "The Skull," and the second time was in "The Voice."