Manny Heffley

Manny Heffley is Greg Heffley's little brother. He calls Greg "Bubby" throughout the first book. During the play at Greg's school in book 1, Manny shouts "BUBBY!" at the top of his lungs and Greg deflects the embarrassment by saying "I think you dropped an apple, Bubby" to another person. He has an overbite and his teeth are far apart. According to Book 1, Manny is a fan of the television show Sesame Street, especially the C is for Cookie sketch. Manny is isn't at all good at potty training, because of Uncle Joe telling to watch out for the Potty Monster, which prevents him from going to the toilet for six months. In the Movie, He is played by twins Connor and Owen Fielding. There is a possibility that he is based on Patrick Kinney, Jeff Kinney's younger brother.

Personality
He is far more spoiled than Rodrick and Greg. Manny is extremely selfish and paranoid, never caring for his brothers at all, and panicking at anything that may harm him in any way. He always gets out of trouble and gets whatever he wants in his life. He is also spoiled to the extreme by his mother, where he often throws tantrums at pre-school when his sandwhiches are not cut in quarters.