| Elizabeth | Ashland | The FBI's special assistant director. Aka: Lizzie. |
| Dr. | Bakalis | Emmy's therapist. |
| Laura | Berg | One of Charlie's victims. |
| Harrison | Bookman | Emmy's fiancee. Aka: Books. |
| Martin | C. Wagner | The Serial Killer. Aka: Charlie, Lew, Darwin. |
| Natalie | Ciomek | A CPD officer. |
| Mary | Connolley | Nora's daughter. |
| Michael | Connolley | Nora's son. |
| Nora | Connolley | Deceased. Victim. |
| Sarah | Connolley | Nora's daughter. |
| Mrs. | Coxley | One of Tom and Michelle's patients. |
| Robert | Crescenzo | New Orleans detective. Detective on Nora Connolley's death. |
| Amee | Czernak | The top prosecutor. |
| Citizen | David | A domestic terrorist. |
| Dorian | Dockery | Emmy and Martha's mother. |
| Emily Jean | Dockery | The FBI data analyst. Protagonist. Aka: Emmy. |
| Shaindy | Eckstein | The writer for FBI's Citizen David's hunt. |
| Nigel | Flowers | The spokesman of New Orleans police department. |
| Michelle | Fontaine | Tom's partner. |
| Joseph | Halsted | Vienna detective. Detective in Laura Berg's case. Aka: Joe. |
| Lee | Homer | A special agent from FBI's tactical unit. |
| Nadia | Jacobius | A reporter at Times-Picayune. |
| Alice | Jagoda | The utility at Cash4u Quick. |
| Olympia | Janus | The FBI's forensic pathologist. Aka: Lia |
| Steven | Macdaniel | One of Charlie's victims. |
| Tom | Miller | Michelle's co-therapist. Charlie's therapist. Aka: Todd Crisman. |
| Betsy | Moriarty | Bill's wife. |
| William | Moriarty | The FBI director. Aka: Bill. |
| Mr. | Oakley | One of Tom and Michelle's patients. |
| Mrs. | Person | One of Tom and Michelle's patients. |
| Eric | Pullman | Emmy's teammate in Citizen David case. Aka: Pully. |
| Dwight | Ross | FBI executive asst. director of criminal, cyber, response, and service branch. |
| Rich | Rudney | The lead agent on the forensic team. |
| Bonita | Sexton | Emmy's teammate in Citizen David case. Aka: Rabbit. |
| Jordan | Sexton | Rabbit's son. |
| Mason | Sexton | Rabbit's son. |
| Ron | Sims | The security guard at Cash4u Quick. |
| Mary Ann | Stoddard | Petty's sister. |
| Acevedo | | Alice's partner. |
| Carlton | | The FBI agent from national security branch. |
| Cobbs | | The FBI agent from science and technology department. |
| Denny | | Emmy's co-agent. |
| Desmond | | Bill's head of security. Aka: Dez. |
| Gordon | | A CPD officer. |
| Graham | | The arsonist. |
| Hendrick | | One of the FBI agents. Books' acquaitance. |
| Louise | | Tom's administrator. |
| Lydia | | Emmy's co-agent. |
| Mayday | | A homeless man. Aka: Marlon Mayberry. |
| McBride | | A CPD officer. |
| Petty | | A homeless man. Books' friend. |
| Roberta | | Dwight Ross's receptionist. |
| Sloan | | The FBI agent from criminal investigative division. |
| Sophie | | Emmy's co-agent. |
| Sperry | | Mayday's friend. |
| Wilson | | The assistant special agent in-charge in Chicago. |
