|Book Appearance?||Yes (Mentioned only)|
Sydney Greene is a character mentioned in The Third Wheel. She attends Greg's school. She is a student with perfect grades and has never missed a day of school. She was a Student Council president candidate, and in her speech she said that if she gets elected, she will get better equipment for the music room and more protective covers for the library books. However, she never got elected.
- Diary of a Wimpy Kid: The Third Wheel (Mentioned only)