* Greg Heffley: The main character and narrator of the Diary of a Wimpy Kid series.
* Rodrick Heffley: Greg's older brother, known for being a rebellious teenager.
* Manny Heffley: Greg's younger brother, known for being a mischievous and annoying toddler.
* Susan Heffley: Greg's mother, often exasperated by her children's antics.
* Frank Heffley: Greg's father, generally well-meaning but can be clueless at times.