Ms. Joan Markham is a minor character in The Amazing World of Gumball. She is the school nurse of Elmore Junior High. Teri, being a hypochondriac, is one of her most frequent visitors. She also dislikes Miss Simian, because she believes that her treatment of students is terrible, as seen in "The Joy."
Ms. Markham appears to be an anthropomorphic bandage. She is dressed in typical nurse fashion, wearing a white dress and hat, with a red cross symbol on them, alongside white shoes. Her limbs are skinny and red. She resembles the bandage paramedics, the bandage doctor, and Harold's employer. She appears to have a bit of an overbite and possesses a large pair of glasses. As revealed in "The Cage," she has long blonde hair under her nurse's cap.
Although not unskilled, she does not appear to care much about the well being of the students overall. This is seen when she chooses not to bother with helping Darwin in "The Allergy." This may be in part due to Teri, who constantly sees her for silly reasons due to her own hypochondria. Despite this, in "The Joy," she gets angry with Miss Simian because she is not treating her students well.
- "The Banana": She is seen with Mr. Small healing Banana Joe after he accidentally pulls off an eye. This is also her first speaking role.
- "The Skull": She gives a medal to Clayton for saving Gumball in Clayton’s imagination.
- "The Bet": She is consulted to fix Bobert three times; on the third time, she gets fed up, and complains that she is a nurse, not a mechanic.
- "Christmas": She tries to keep Marvin from exploding.
- "The Virus": She makes a checkup to Gumball, and argues with Teri because Teri thinks she is useless.
- "The Boombox": She is one of the passengers on an airplane.
- "The Coach": She regretfully gives Gumball and Darwin a slip to skip going to the gym.
- "The Joy": She doubts Miss Simian's claims of the Joy infection, and later falls victim to said infection.
- "The Law": She briefly appears outside of the police station when Felicity is arrested.
- "The Allergy": Darwin goes to her when he gets an allergy but she immediately turns him away because she was annoyed with Teri.
- "The Parking": She is seen at Elmore Hospital.
- "The Girlfriend": She is part of Jamie's apology note.
- "The Advice": She gets attacked by the Abraham Lincoln goat.
- "The Parasite": She is seen checking up Anais and Jodie's parasite.
- "The Love": She is seen at Elmore Hospital.
- "The Compilation": She is seen with the bandage doctor and the old doctor performing surgery on someone at the hospital.
- "Teachers": (flashback)
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- A recurring gag with Ms. Markham is her saying "I'm a doctor, not a ____," referencing the wide variety of species at Elmore Junior High. One example is "I'm a doctor, not a mechanic." when asked to fix Bobert. This may be a reference to the popular character Dr. Leonard H. "Bones" McCoy from the original Star Trek series, who had a similar catchphrase.
- Ms. Markham's name is revealed in "The Cage."
- Ms. Markham's full name is based on the name of one writer for the show, Joe Markham.
- She is the only character in the school faculty that did not appear in "The Inquisition."