Clyde Heffley was Greg Heffley's great-uncle who only appeared in Diary of a Wimpy Kid Online. He was replaced by Arthur Heffley in the book series. He doesn't appears to say any words but mutters noises like "Muurp" "Ruup". This confuses Greg because he doesn't know if he is really meaning something or not, just like Arthur Heffley. He stayed at the Heffley's house for two days on Thanksgiving day.