"Greg" Heffley is the main character of Diary of a Wimpy Kid book series. He is an outcast who has, according to him, unreliable friends. He is very concerned about his popularity level and how he looks in public. He absolutely loves video games and slacking off, taking after his older brother Rodrick. As much as he dislikes his older brother, he takes up a lot of traits from him (selfish, slacker, etc.) He also has an interest in cartooning and making comics. Greg Heffley's real name in person is Zachary Gordon.
Rowley Jefferson is Greg Heffley's best friend and is a major character in the Diary of a Wimpy Kid series. He has protective parents who aren't fond of Greg's behavior, assuming that he is a bad influence. He is often seen as an anti-hero in the series, despite being the main character's best friend, as he often does idiotic things to get Greg in trouble while he gets off scot-free. Despite this idiotic behavior, though, Rowley always wishes the best for everyone. Rowley Jefferson's real name is Robert Capron.
Rodrick Heffley is Greg and Manny's older brother, the main character of the second book and a bully throughout the series. He's a junior in high school. Rodrick has a band called the " Loaded Diaper".Rodrick Heffley's real name in person is Devon Boustick.
Manny Heffley is Greg Heffley's younger brother, and one of the antagonists of the book. Throughout the first book, he calls Greg "Bubby."Greg thinks that Manny is annoying and get all the attention. Manny Heffley always gets more gifts than his brothers. Manny Heffley is played by two people. Manny is a twin in real life. They both were actors in the movie. One twin is Connor Fielding and the other is Owne Fielding.
Susan Heffley is Mrs. Heffley. She is the mom of Greg, Rodrick,and Manny Heffley. Susan is married to Frank Heffley.
Frank Heffley is Mr. Heffley. He is the dad of Greg, Rodrick and Manny Heffley. Frank Heffley is married to Susan Heffley.