Greg Heffley is the main character in the popular book series "Diary of a Wimpy Kid," created by Jeff Kinney. He is a middle school student who often finds himself in humorous and awkward situations. Greg is known for his relatable personality, as he navigates the challenges of growing up, friendships, and family life. Throughout the series, Greg keeps a diary where he shares his thoughts and experiences. He often faces conflicts with his best friend, Rowley Jefferson, and his older brother, Rodrick Heffley. Greg's adventures highlight the ups and downs of adolescence, making him a beloved character among young readers.