Manny Heffley

Manny Heffley is Greg Heffley's younger brother, and one of the antagonists of the book. Throughout the first book, he calls Greg "Bubby." In the movie, he is played by twins Connor and Owen Fielding. Manny is loosely based Patrick Kinney, Jeff Kinney's younger brother.

Personality
Manny Heffley is thought by Greg to be extremely selfish, spoiled, self-centered, greedy, and paranoid, never caring for anybody at all. He always gets out of trouble and gets whatever he wants in his life by showing cute and troubled looks or crying. He is thought to be spoiled by his parents, which always makes Greg unhappy, because he, nor his brother Rodrick, has ever gotten as many privileges as Manny. Manny can't seem to get the concept of potty training; this is mainly because of Uncle Joe (Greg in the film) telling him to watch out for the Potty Monster, which prevented him from ever stepping into the bathroom for six months. According to the first book, Manny is a fan of the television show Sesame Street, especially the C is for Cookie sketch. Manny's interests are reasonable for his age, always asking for toys and items for toddlers.

Appearance
Greg's illustrations depict Manny having an overbite and his teeth being spaced far apart. He looks like "a buck toothed crocodile", according to the movie diary. Manny is always depicted with a white shirt and colored shorts. Much like Greg, he has protruded hair, with three lines sticking out. Manny is about the size of a letter in Greg's journal, showing that Manny is very young.