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