Principal Luna is the main antagonist of the series.
He is the principal at Westley School for the Performing Arts. He is of Hispanic descent. He has a tendency to over-use the word "fantastic" and is always trying to make money for the school. He has a crush on the substitute lunch lady, Ms. Squattinchowder. He owns 36 out of the only known 37 of a rare type of spatula. Luna tries to rival Sunny for coolness. He is voiced by Jeff Glen Bennett.
- Principal Luna has trouble with his hearing.
- He is shown to be selfish in "Study Buddies".
- I felt fine after those mimes start waving their pom-poms.
- Yes we cannot.
- Your students are fantastic.
- My name is Principal Luna. You stole my woman. Prepare to fry!