Manny Heffley

Manny Heffley is Greg Heffley's younger brother. He calls Greg "Bubby" throughout the first book. In the movie, he is played by twins Connor and Owen Fielding. Manny is loosely based Patrick Kinney, Jeff Kinney's younger brother. There is a chance than his full name could be Manfred. He has also cried at least once in all of the books. In the movie, He is played by twins Connor and Owen Fielding.

Personality
Manny Heffley is far more spoiled than Rodrick and Greg. He 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, by showing cute and troubled looks. He is also spoiled to the extreme by his mother, which always makes Greg unhappy. Manny is isn't at all good at potty training, because of Uncle Joe telling to watch out for the 'Potty Monster', which at one point prevents him from going to the toilet for six months.

Appearance
Greg's illustrations depict Manny having an overbite and his teeth far apart. 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.

Interests
According to Book 1, 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 little children.

Greg Heffley
Greg and Manny do not seem to get along very well, mainly due to his mother interrupting in their fun. An example could be in Rodrick Rules, where Manny laughs due to Greg pulling funny faces, then his mother interrupts, telling Manny that he could be 'killed', setting Manny off in tears. Manny always interferes in Greg's sleepovers, often forcing Rowley to leave early. In The Last Straw, Manny starts calling Greg 'Ploopy' instead of Bubby. This was because Manny's blanket got thrown away, setting him off in anger, even though Greg hadn't got anything to do with it. Greg also sets Manny off in tears for calling him Ploopy. Manny, also complains about the simplest of Mistakes on Greg, even being the nicest ones.

Rodrick Heffley
Manny and Rodrick's relationship is currently unclear, but Rodrick does respect him as the person who does all the dirty work for him; he uses Manny for his fundraising, and for other purposes as well.

Gramma
Manny has a somewhat unknown but curious relationship with him and his brothers' grandmother. Their grandmother mainly has pictures of Manny everywhere; the only picture depicting Greg has his head turned away from the picture.

Parents
Manny overall, has an extremely good relationship with his parents, since they give a lot of pity to Manny, giving him whatever he wants in his life and providing him far more hospitality than what they would do to their other sons, Greg and Rodrick. Manny's mother, however, spoils him the most, as she is the one who will always provide Manny hospitality at school. (For example, she drives all the way from work to give an extra slice to Manny's sandwich, when it was not cut in quarters.) Manny's parents also let him bring him anything he wishes to church to pass the time, which is a privilege that neither Greg or Rodrick had when they were Manny's age.

Rowley Jefferson
Although there is no existent relationship between Rowley and Manny, they do share one thing in common, which is that their parents always baby them. Also, Manny has always made Rowley go home early when Rowley comes for a sleepover. Manny also thinks that Rowley is his hero.

Crying
Manny has cried at least once in every book.
 * Diary of a Wimpy Kid: Cries after accidentally swallowing a black thread, believing it was a spider.
 * Rodrick Rules: Cries after Susan tells Greg "You could have killed him!"
 * The Last Straw: Cries when Rodrick melts his toys, and cries at church when Greg calls him a 'Ploopy'.
 * Dog Days: Cries after being told by Rodrick that the hump is the worst seat in the car.

Trivia

 * Manny apparently hasn't been shown to have his birthday yet, but it may be shown in Book 5.
 * Manny stops calling Greg "Bubby" and "Ploopy" by the fourth book.
 * It is implied that Manny has gone potty training for about three years.
 * Greg also states in the third book that Manny "is on his third or fourth preschool by now." This implies that Manny is actually older than Greg depicts him to be.