Peter and Lisa were two kids who were picked to clean the board back in elementary school. When their names were called, the rest of the kids would taunt them with cat calls. Greg says that he was hoping for the same reaction when he was picked to be Bethany Breen's lab partner, and even left a hint to the rest of the students. However, he did not get what he was hoping for, saying that "everybody must have moved on from that". They only appear in the Third Wheel.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)