| Inga | Alder | Activist. |
| Jayden | Astley | Robin's only real friend. |
| Kayla | Bishop | Robin's teacher. |
| Viv | Britten | Grad student. |
| Alyssa | Byrne | Robin's mother. Theo's wife. AKA: Ally. |
| Robin | Byrne | Theo Byrne's son. |
| Theo | Byrne | Narrator. Protagonist. AKA: Mad dog. |
| Dr. Ellen | Coutler | Scientist. |
| Martin | Currier | One of Wisconsin's high-profile scientists. |
| Mark | Floyd | The children's caseworker. |
| Charlie | Gordon | A fictional character. |
| Sergeant | Juffers | Policeman at Capitol. |
| Dr. | Lipman | Robin's school principal. |
| Michael | Maxwell | Ally's ex-boyfriend. |
| Dr. | Mcmillian | Theo's former teacher and employer. |
| Dee | Ramey | Producer of Ova Nova. |
| Charis | Siler | The children's caseworker. |
| Carl | Stryker | Theo's colleague and co-author. |
| Eddie | Tresh | Robin's acquaintance. |
| Josette | Vacarro | Robin's classmate. |
| Ethan | Weld | Robin's classmate. |
| Adele | | Ally's parent. |
| Chester | | Robin's dog. Deceased. |
| Cliff | | Ally's parent. |
| Fagin | | One of the Police Officers. |
| Ginny | | A tech. |
| Jayden | | Robin's teacher. |
| Jinjing | | Theo's assistant. |
