Mr. Nuzzi is a prison guard and the main antagonist in Diary of a Wimpy Kid: Old School . He attends the field trip to Hardscrabble Farms as a chaperone and gets put with most of the troublemaking kids due to his job. He is seen confiscating a chocolate chip cookie that Duane Higgins tried to smuggle in. When Greg's cabin-mates are planning the raid on the girl's cabins, Mr. Nuzzi gets suspicious and checks up on them. When he sees them with rags wrapped around their faces, he warns them not to leave the cabin. He leaves, but later returns with a tube of baby powder, which he sprinkles around their cabin door. That way, if the DO try to leave, he will be able to see their foot-prints.
Greg foils his plan by having each one of his cabin-mates step into Mr. Nuzzi's footprints by using the chapter from The Essential Book For Young Lads called Hiding Your Numbers. That way it will look like the baby powder has been untouched. On their return, however, they accidentally trample it.
- Diary of a Wimpy Kid: Old School (First and only appearance)