"Because if I'm the only one in the entire school then I'll be the first one in line for lunch"-- Crayon Boy
Crayon Boy, or Oliver, is a member of the Gallagher Safety Patrol who was fed up with letting the other students cut in front of him in the lunch line; leaving him with nothing left to eat when he reached the front of the line. He pretends to have psychic powers and "predicts" that other students are about to commit crimes.
After Numbuh 2 and Numbuh 4 were arrested, Numbuh 3 becomes the detective solving the mysteries of the arrests. Crayon Boy was seen working with the Delightful Children From Down The Lane, but they were soon arrested for running in the halls. He had also cut a deal with Joe Balooka and had Kuki then Joe arrested by the Hall Squad. Crayon Boy then had the Hall Squad arrest themselves.
This, in turn, made him the only kid not in detention during lunch time. His plan succeeds, but when he asks for fifty pizza bagels, the cafeteria lady tells him that they are next week's lunch, and they are currently serving lima bean sandwiches.
A disgusting sandwich is then plopped onto his tray shortly. He then rips the sandwich to pieces before crying over still not getting any pizza bagels.
- He is perhaps the only villain in the show who has never faced defeat by the KND, making him the most successful villain to date of having never been punished. However, while he succeeded in getting the other kids in detention so he could be the first in line in lunch, he did not succeed in getting his desired pizza bagels as they was next week's lunch.
- His pretended psychic future drawing abilities appear to be based off the character Isaac Mendez from the NBC show Heroes as his pupils disappear when he draws out the future which is similar to what happens to Isaac when he paints the future out.