The Mother of Ava Willis and retired English teacher at Quillsville Central.
- FULL NAME: Margaret Harriett Willis (nee Zinn)
- OCCUPATION: Retired veteran educator (“The Good Educator”).
- PROUDEST ACHIEVEMENT: Received Sagamore of the Wabash for having her thyroid blown off by 100 students.
- GREATEST DISAPPOINTMENT: Ava Willis
- GREATEST ACHIEVEMENT: A.A. Willis and Albert Willis
- FAVORITE PASTIME: Stopping by the Indiana Statehouse to give Robert Orr the finger
- VOICED BY: Ava Zinn
- FIRST APPEARANCE: “Pilot” (S01 E01)
- FINAL APPEARANCE: “Death Picks Peggy” (S06 E10)