Bully

This child appears to be a fictional character who appeared in one of the first pages in Diary of a Wimpy Kid and it's online version. When Greg said he would be seen as a sissy with a diary, he would remember to stay away from people with it.

Appearences

 * Diary of a Wimpy Kid (first book appearence)
 * Diary of a Wimpy Kid Online (first appearance)
 * Diary of a Wimpy Kid (film) (removed animated scenes)

Trivia

 * He appeareared in Diary of a Wimpy Kid and Diary of a Wimpy Kid Online.
 * He is seen in the film at the beginning, where he punched Greg, saying "Sissy!".
 * He is, not counting Greg, the first to appear in the whole series.