Greg Heffley: The protagonist of the series, Greg is a middle school student who often finds himself in awkward and hilarious situations. He's known for being a bit of a goofball and trying to navigate the social complexities of adolescence.
Rodrick Heffley: Greg's older brother, Rodrick is a high school student who is often cruel and uncaring towards Greg. He's a musician and loves to play pranks on his younger brother.
Manny Heffley: Greg's little brother, Manny is a toddler who is often the target of Greg's (unintentional) mischief.
Susan Heffley: Greg's mother. She's a caring and supportive mother, but often exasperated by Greg's antics.
Frank Heffley: Greg's father. He's a well-meaning but sometimes clueless parent. He's known for his love of cheesy jokes and his obsession with the "Cheese Touch."
Rowley Jefferson: Greg's best friend, Rowley is kind, naive, and often gets caught up in Greg's schemes. He's known for his clumsy nature and his loyal friendship with Greg.
Fregley: A peculiar and often smelly classmate of Greg's. He's known for his love of bugs and his unique way of looking at the world.
Chirag Gupta: Greg's nerdy and often overlooked classmate. He's known for his love of math and his tendency to spout random facts.
Holly Hills: A popular girl in Greg's grade, Holly is Greg's crush and often the object of his daydreams.
Mr. and Mrs. (Mrs. and Mr.) Heffley: Greg's grandparents.
These are just a few of the many characters in the *Diary of a Wimpy Kid* series. There are a lot of other interesting and memorable characters that appear throughout the books.