Metal Gear Solid: Peace Walker/Characters

Snake
Snake is a world-renowned soldier and infiltrator. Formerly affiliated with the CIA's FOX unit, Snake is now a mercenary commander with a following of fanatically-loyal soldiers organized into the unit Militaires Sans Frontieres (MSF). In the 1960s, he was sent into Soviet territory to assassinate his mentor The Boss, averting global thermonuclear war. After the completion of this "Operation Snake Eater" and saving the world, Snake became known among soldiers and mercenaries in the West and East as "Big Boss."

Kazuhira Miller
"Kaz" is Snake's best friend and right-hand man. Whereas Snake presents MSF with a vision, Kaz minds the details toward making that vision happen. Like almost all MSF soldiers, Kaz met Snake on the battlefield as his enemy, but was drawn to the ever-growing legend of Big Boss. Kaz is friendly, flirtatious, well-read, and has a brilliant for business. His capabilities will help grow MSF into a force to change the world. He seems to be the one Snake trusts with mission control, offering Snake advice and command over the radio while Snake is in the field.

Paz Ortega Andrade
A girl from Costa Rica with a vision for world peace so strong, she besought Big Boss himself to help return peace to her country. She traveled to Columbia with Professor Gálvez to convince Snake and Kaz to deploy MSF to Costa Rica, telling them the story of her escape from the clutches of an unknown and illegally armed group. After this meeting, Paz remains in touch with Snake, offering him advice and information on Costa Rica's history and wildlife.

Hot Coldman
Coldman is the CIA Station Chief in Latin America, shunted there from Langley after a falling out with the DCI. He personally oversees the development of the Peace Walker Project in a laboratory in Costa Rica. He is responsible for the operations of the armed group, the Peace Sentinel, in Costa Rica. He believes nuclear deterrence is based on the flawed logic that human beings would not necessarily retaliate against a nuclear strike and will go to any length to prove his theory. By all appearances, Coldman is the story's antagonist.

The Boss
The Boss was Snake's mentor and most beloved. She was known among soldiers all over the world as the "Mother of Special Forces." She and her supernatural team of soldiers known as the Cobra Unit led the Allies to victory in World War II. Her defection to the Soviet Union forced the CIA to send Snake to assassinate her in order to avert global thermonuclear war. Despite being dead for a decade, The Boss casts an immense shadow over the characters and events of this game.

Pacifica Ocean
A long-hidden agent who had played Snake, Zadornov, and Coldman against each other all along. An agent of Cipher who attempts to steal Metal Gear ZEKE and only reveals herself during the final battle.

Cipher
A clandestine organization of clandestine organizations, Cipher represents the real power behind the events of this game. They reveal themselves during the final mission as their agents try to steal Metal Gear ZEKE and force Big Boss and his MSF under their control.