| Bellamy | Blake | Cotton's friend. The boy who hostaged Chancellor Jaha. |
| Octavia | Blake | Bellamy's sister. One of the prisoners. |
| Clarke | Griffin | One of the protagonists. The girl Well falls in love with. |
| Carter | Jace | Luke's roommate. |
| Chancellor | Jaha | Well's father. The chancellor. |
| Dr. | Lahiri | The council's chief medical advisor. |
| Glass | Sorenson | Well's best friend. |
| Sonja | Sorenson | Glass's mother. |
| Ali | | Luke's colleague. |
| Asher | | An Arcadian. |
| Bekah | | Luke's guard friend. |
| Camille | | Luke's childhood friend. |
| Cassius | | One of the prisoners. |
| Colton | | Bellamy's friend. A guard. |
| Cora | | Glass's friend. |
| Eliza | | The girl from Walden. |
| Graham | | The boy from Phoenix. |
| Huxley | | Glass's friend. |
| Lilly | | One of the prisoners. |
| Lise | | Clarke's cellmate. |
| Lucy | | The oldest hominid remains earthborn. |
| Luke | | One of the guards. Glass's ex-boyfriend. |
| Rhodes | | The vice-chancellor. |
| Thalia | | Clarke's former cellmate and only friend. |
| Wells | | The chancellor's son. Aka: Chancellor Junior. |
