In Diary of a Wimpy Kid: Cabin Fever, he appeared after being absent for 3 books. During the Anti-bullying Sign Contest, when the girls were fighting over their signs, Mr. Roy had to step in to stop the event from turning into a full-scale riot. When Greg made a newspaper, Mr. Roy didn't like his idea (as it was unauthorized) and wanted to shut it down. When the school was damaged he told Greg about his punishment and let him clean the mess after when Greg told what happened.
In Diary of a Wimpy Kid: The Third Wheel, after pantsing becomes a problem at school, he gives the boys a talk about it, but then he gets pantsed from under the bleachers. It is unknown who did it, so that kid became known as the "Mad Pantser".
In Diary of a Wimpy Kid: Hard Luck, he appears near the end of the book and tells Greg that his grades are slipping. If Greg doesn't improve them, he'll have to go to summer school, although Greg thinks he may only be trying to scare him.
In the movie, he has a Chinese decent and was played by Chinese-Canadian actor Raugi Yu. He only appeared in the T.V. advertising the Safety Patrol and wore a grey suit and a tie.
In the book, he has a round head, a similar hairstyle to Frank Heffley, a beard which covers most of his mouth until the starting of his semi-circle nose, and ears which have a dot and a curved line besides them. He wears an old-fashioned buttoned suit with a bow tie and trousers and shoes about the size of Greg's.