Names used by others: "Big Boss", "Snake" Real name: John (Jack) Likes: Cigars, cardboard boxes Personality: Basically cool and composed, but at his core, he is deeply compassionate, values his comrades, and is a kind person. While he occasionally cracks jokes and shows a bright, unique, and playful side, he can also be airheaded, dense, and quite gluttonous. He doesn't hesitate to put his life on the line for those he considers allies. When the time comes, he has no hesitation, but he generally dislikes killing, even when it comes to enemies.

Real name: Adamska Former CIA, former Spetsnaz, former GRU Ocelot Unit commander. Known by the alias Shalashaska. Diamond Dogs Advisor Likes: SAA, Spaghetti Westerns Personality: A specialist in marksmanship and interrogation who wears a duster coat and spurred boots, loving everything about Spaghetti Westerns. He is highly skilled in shooting, boasting that he "understands the bullet's feelings," and excels at ricochet shots and fanning. He continues to use the SAA, loving it as the "greatest handgun ever made." He is also a professional and enthusiast of interrogation. He worships Naked Snake. While his real name is Adamska, he is basically never called by it by others in the story; his name is unified as "Ocelot."

Nickname: Kaz Half-Japanese, half-American Diamond Dogs Deputy Commander Personality: Contrary to his tough appearance with blonde hair and sunglasses, he has a very jovial and frank personality. He is compassionate and full of humor. He often introduces strange things developed by the R&D team to Big Boss just to see his reaction. He was surprisingly fond of the cardboard tank, which left Kaz bewildered, wondering if he was the one who was crazy. As Snake's right-hand man, he possesses not only combat prowess but also broad and deep knowledge. He is particularly well-versed in military-related information, past conflicts, and political backgrounds. He is a womanizer and once got into a fistfight with Big Boss in a sauna after being scolded.

Name used by others: "Boss" Naked Snake's phantom Only Venom has a prosthetic left arm Likes: Electronic cigars (Phantom Cigars) Personality: Though a man of few words, he cares deeply for his comrades. Because he looks out for the staff at Mother Base and the soldiers rescued from the battlefield, he is highly respected and admired as a leader by many soldiers, many of whom joined Diamond Dogs specifically to follow him.