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