|“Let me get something straight. This is a journal, not a diary. When Mom went to buy this thing, I clearly told her not to buy anything with the word "diary" on it. This just proves Mom doesn't understand anything about kids my age. The only reason I agreed to write in this thing is because when I'm rich and famous I'll have better things to do than answer people's stupid questions all day long. Mom got me this thing so I could write down my feelings about starting middle school. I always figured they'd make a movie about my life. But I didn't think they'd start the story here. Because, seriously, who wants to see a movie about a kid who's stuck in middle school with a bunch of morons?”|
|— Greg narrating|
Gregory "Greg" Heffley is classified as a wimp and is a student of Westmore Middle School. Greg is very concerned about his popularity level and how he looks in public. He absolutely loves video games, comics, and slacking off, taking after his older brother, Rodrick.
- He takes up a lot of traits from Rodrick Heffley.
- He also has an interest in cartooning and making comics.
- He is the best friend of Rowley Jefferson.
- Main article: Greg Heffley/Gallery