| Rosaline Mullins | |
 | |
| Nickname | Roz/ Ms. Mullins |
| Age | 41 |
| Occupation | Principal of Horace Greene Prep (former) |
| Band Job | N/A |
| Portrayer | Joan Cusack |
Rosaline Mullins is the principal of Horace Green Prep School. She is portrayed as very uptight and strict principal, yet caring and benevolent. She is very tall and slim.
Appearance