Mr. Harkin

Mr. Harkin is a adult who was briefly mentioned and appeared in Cabin Fever.When Greg was 4 years old,Susan and Frank had a cocktail party,Mr. Harkin was invited to it.Harkin wanted to use the bathroom,so he opened the door.Greg was already there using the toilet,Greg was young and didn't know that your supposed to lock.Harkin went away.Greg felt embarrased and went to his parents and told them what all happened.

Appearances

 * Diary of a Wimpy Kid: Cabin Fever (first appearance)