Greg Heffley
Greg is the main protagonist in the "Diary Of A Wimpy Kid" series. He is around 12 or 13 years of age.... It didn't say the actual age. He is the middle son of the family and has a boring life. That's probably why he frowns alot throughout the series. Anyways in this novel it talks about the start of his seventh grade year and it stinks. Then he gets very lazy and his dad tries to put him in military camp to toughen up.
Rowley Jefferson
In this book this is Greg's best friend. I said "In this book" because in one of the later books he becomes his ex- best friend. Until then though he is the second main character in this novel. He is around the same age as Greg.
Susan Heffley
She is Greg's mom and is very embarrassing and overlyprotive
Frank Heffley
Greg's dad. He has taken an interest in american history and made his own replica of a battle field that gets broken.
Rodrick Heffley
He is the oldest brother in the family and is in an band called Loded Diaper. He give Greg bad advice to survive school. He always gets in trouble too.