Dieter Liederhosen (voiced by Jeff Bennett) is an obese German kid who attends Hazelnut Middle School. He is also in the same grade and classes as Pepper Ann, Nicky Little and Milo Kamalani. He is seen talking to Pepper Ann outside Hazelnut in some episodes. In "Have You Ever Been Unsupervised" he is having a thirteenth birthday party, which will be unsupervised.
- "Have You Ever Been Unsupervised"
- "Quiz Bowl"
- "Green-Eyed Monster"
- "A 'Tween Halloween"
- "Like Riding a Bike"