Rowley

Rowley Jefferson is Greg's best friend and is usually the deuteragonist of the Diary of a Wimpy Kid series. He has had a major role in nearly every book (with the exception of the 9th, 10th, and 12th books). He has overprotective parents who aren't fond of Greg's behavior (specifically Mr. Jefferson, but his mother can also seemingly get annoyed by Greg too), assuming that he is a bad influence (which for several reasons he is). He was the main antagonist in Diary of a Wimpy Kid: The Third Wheel, and secondary antagonist of Diary of a Wimpy Kid: Hard Luck. He is often seen as an anti-hero in the series, despite being the main character's best friend, as he often does idiotic, nonsensical things, which results in getting Greg in trouble while he gets off scot-free. Despite this idiotic behavior, though, Rowley always wishes the best for everyone, and is a very nice and innocent kid. Rowley is an immature boy in several ways. For example, he sleeps with his stuffed toys, he likes his Dinoblazer Action Figures and he even quit writing his popular comic, Zoo-Wee-Mama, because he needed time to play with his Dinoblazer Action Figures. He also likes a singer called Joshie, whose audience is young children, mainly girls. On Christmas, he gets many childish things, even giving Greg childish toys like a Big Wheel. In the second film, he got very scared after watching a horror movie called "The Foot," and had to get his parents to take him home.

In the fourth book, he kept his eyes covered the entire time while Greg tried to watch the horror movie, Hello, You're Dead. Also, when he was sleeping in a beach lodge, he got a nightmare that there was a chicken underneath him, which made him scream out loud. His parents calmed him down and Rowley went and slept in their room. In the movie, he goes with his parents to nearby places. If not, then he'd have to follow Greg. In the book, he went in kiddie rides for little kids while Greg was in the Cranium Shaker, a ride that was meant to terrify and disorientate its riders. In Dog Days, his dad scolded at Greg for not showing up for 10 minutes.

When it's his birthday, he goes to childish places and invites kids in his karate class who are about 8-11 years old and is happy even when he gets childish toys. He is also a fun, loving boy, that many like more than Greg Heffley usually. He is a good friend of Greg and despite the fact, Greg often uses him (carry his stuff, give him piggy-rides, write English work for him and scout for dog droppings) he still doesn't question or go against Greg and is willing to be much like Greg.