Mrs. Mancy is the principal of Westmore Middle School. She has a minor but recurring role in the books.
Role in The Last Straw
In the Valentine's Day Dance, she told every student that the dance would count 20% of their Phy Ed grades and went with Mr. Underwood noting down the marks.
Role in Cabin Fever
Role in The Third Wheel
She is mentioned by Greg when she announced that there is a limit of toilet papers the kids can bring and only 5 are allowed.
- Diary of a Wimpy Kid: The Last Straw (First and only physical appearance)
- Diary of a Wimpy Kid: Cabin Fever (Mentioned)
- Diary of a Wimpy Kid: The Third Wheel (Mentioned)
- It's possible that she might be friends with Greg's mom, because in the first book of the series, when Greg talks about his attempts of being put in the easy reading group at school, he mentions that his mom is "really tight" with the principal, and did some string pulling on her part to get Greg in the advanced reading group.
- It's also possible that Greg could've been talking about a different principal.