Mu Elementary School is a school in Clamburg. The evil Vendetta is self-elected in charge of the school, since every teacher, with an exception of Ms. Minty, are afraid of her and her homemade fiends.
The school is split into four different buildings. The first building to the left includes class room 1 and 2, the second includes class room 3 and 4. The third building, however, has not ever been seen inside, so its function is unknown. It is most likely the school library. The fourth building is the cafeteria, in which Mrs. Millet is the lunch lady.
Like the rest of Clamburg, the environment is very dull and gray. The schoolyard is full of Vendetta's fiends. Only Charlotte finds it amusing.
There is a sign that says Mu Element as most of it was bitten off, probably by the Giant Kitty. Obviously, the "element" used to say Elementary, but it is unknown what "mu" used to be. It is possible that the "mu" stands for "muffin", as one of Amy Winfrey's works before Making Fiends was Muffin Films.
- Grudge (follows Vendetta to school every day)
- Unidentified pink schoolgirl