Dennis Tracton is a character who appeared in Diary of a Wimpy Kid: The Meltdown. Greg was having an International Showcase project at school. When his class had to choose a country to work on, Greg tried to choose Italy because he is a HUGE pizza fan. But it turned out Italy was a really popular country, so the teacher had to do a random drawing to decide who would get to do it. She chose Dennis Tracton, which Greg thinks wasn't fair because Dennis is lactose intolerant and can't eat cheese.
- Diary of a Wimpy Kid: The Meltdown (First and only appearance)