| Sister |
Augustinia | Religion teacher |
| John |
Baggott | Bree's best friend |
| Mrs. |
Baggott | John's mother |
| Theo |
Baranski | Obese student |
| Christopher |
Beeman | Archway student who went AWOL |
| Erik |
Bienkowski | Senior lacrosse player |
| Logan |
Blaine | Margot's classmate |
| Tyler |
Brodsky | Rex's wingman |
| Sergeant |
Callahan | Police officer from Menlo Park |
| Rex |
Cavanaugh | Leader of the "Maine Men" |
| Fitzgerald |
Conroy | Mr. Cunningham's friend; director |
| Richard |
Creed | Volleyball coach |
| Mr. |
Cunningham | Drama teacher |
| Bree |
Deringer | State senator's daughter |
| Henry |
Deringer | Bree's father; a state senator |
| Henry |
Deringer Jr. | Bree's brother |
| Ronny |
DeStefano | New student at the school; murdered |
| Donte |
Greene | Olivia's ex-boyfriend |
| June |
Hayes | Olivia's mother |
| Olivia |
Hayes | Member of the "DGM", A famous girl |
| Mr. |
Heinrich | Margot's AP teacher |
| Margot |
Mejia | Member of the "DGM" |
| Mr. |
Phillips | Facility manager |
| Coach |
Sampson | Tennis coach |
| Maria |
Sharapova | Russian professional tennis player |
| Mrs. |
Shi | Librarian |
| Amber |
Stevens | Mean girl at the school |
| Kyle |
Tanner | Rex's wingman |
| Dr. |
Tournay | Margot's doctor |
| Father |
Uberti | Head of the school |
| Barbara Ann |
Vreeland | Barista |
| Kitty |
Wei | Student body vice president |
| Lydia |
Wei | Kitty's sister |
| Sophia |
Wei | Kitty's sister |
| Shane |
White | John's friend; Bree's crush |
| Chris |
| Ronny's friend |
| Cordy |
| Shane's bandmate |
| Ed |
| Olivia's classmate |
| Jezebel |
| Amber's friend |
| Mika |
| One of Kitty's colleagues |
| Peanut |
| Amber's friend |
