A static character remains essentially the same throughout a story. However, as the main character in the Diary of a Wimpy Kid series, Greg Heffley undergoes significant changes and personal growth across multiple books. As he navigates middle school experiences, Greg learns from his mistakes, confronts personal challenges, and shows signs of maturation. By the end, you can tell he isn't exactly the exact same character as the 1st book. Therefore, he is a dynamic character.