| Pro | Sharon | | A flight attendant. |
| | Courtland | Gentry | CIA agent. Protagonist. Aka: Gray Man, Violator, Court. |
| | Doug | Spano | A CIA officer. |
| | Suzanne | Brewer | Court's handler. A CIA programs and plans officer. |
| 1 | Zoya F. | Zakharova | A former Russian spy. |
| | William | Fields | A security officer. |
| | Feodor | Zakharov | Zoya's father.
Head Russian Military Intelligence (GRU). |
| | Matthew | Hanley | CIA deputy director of operation. Aka: Matt, Poison Apple. |
| | David | Mars | A London-based businessman. Aka: Mr. Black. |
| | Barnacle | | David Mars's inside man at the CIA. |
| | | | SCIF - Sensitive Compartmented Information Facil. |
| | Artyom | Primakov | A Russian mafia. Aka: Roger Fox. |
| 2 | Palmer | | A British CIA agent. |
| | Scott | | A British CIA agent. |
| 3 | Anthony | Kent | A Nottingham-based criminal. |
| | Dirk | Visser | A banker that Kent kidnapped. |
| | Mickey | | Kent's colleague. Deceased. |
| | Martin | | Kent's colleague. Deceased. |
| | Davy | | Kent's colleague. |
| 5 | Jay | Seekins | The assistant deputy director of operations. |
| | Marty | Wheeler | A CIA assistant deputy director of support. |
| 6 | Lucas | Renfro | A CIA deputy director of support. |
| 7 | Kim | Dong-Woo | Janice Won's security. |
| | Nam | Jun-Ho | Janice Won's security. |
| 9 | Maria | Palumbo | A CIA senior of executive operations. |
| 10 | Alexi | Filotov | A Russisn GRU agent. |
| | | | CDC - America's center for disease control division. |
| 11 | Jon | Hines | Fox's personal bodyguard. |
| 12 | Solnsevskaya | Bratva | London brigade Russian multinational criminal organization. |
| 17 | Nigel | Halton | A criminal from South Hampton. |
| | Kevin | Ball | A criminal from Bristol. |
| | Charlie | Jones | The head of the Nottingham syndicate. |
| | Zachary Paul | Hightower | A CIA special activities division agent. Aka: Zack, Romantic. |
| | Arkady | Kravchenko | A Soviet airforce pilot. An SVR contract agent. |
| | Nikolai | Asianov | SVR's deputy operations chief. |
| | Yuri | Popov | Arkady's handler. |
| 19 | Tony | Palace | A man who runs the largest criminal firm. |
| | Reggie | Palace | Tony's son. |
| 20 | Terrence Albert | Cassidy | A lawyer who contacted Charlie. David Mars's partner. |
| 22 | Walt | Jenner | A CIA special activities division (Ground Branch). |
| 25 | Vladimir | Belyakov | A Russian oligarch. Feodor's best friend. |
| 26 | Maria | Palumbo | A CIA officer. |
| | Alf | Karlsson | A CIA executive operations head. |
| 27 | Gorik | Shulga | Manager gateway shipping
& air freight/London. SVR agent. |
| 29 | Ari | | Fox's assistant. |
| 33 | Trina | Renfro | Lucas's wife. |
| 34 | Feo | Feodorovich | Zoya's brother. |
| 39 | Donald | Fitzroy | A London-based security consultant. |
| | Claire | Fitzroy | Donald's granddaughter. |
| | Kate | Fitzroy | Donald's granddaughter. |
| | Elise | | Claire and Kate's mother. Donald's daughter-in-law. |
| 40 | Lou | | Donald's security man. |
| | Irene | Carson | Zoya's mother. |
| 43 | Stesnaz | | A former GRU military. |
| 45 | Katrina | Lawrence | Renfro's mistress. Hanley's ex-wife. |
| | Jason | | Owner of the Volvo that Court took. |
| 48 | Siloviki | | A Russian Oligarch. |
| 51 | Maurice | | Court's principal trainer at CIA. |
| 54 | Chris | Travers | One of the ground branch men from Walt Jenner's team. |
