Big Boss Real name: John (Jack) Commander of M.S.F. Likes Cigars, cardboard boxes Personality Basically a cool and composed individual, but at his core, he is deeply caring, compassionate, and kind toward his comrades. While he occasionally cracks jokes and shows a bright, unique, and playful side, he can also be airheaded, dense, and gluttonous. He is willing to put his life on the line for those he recognizes as allies. He does not hesitate when the time comes, but he generally dislikes killing, even when it comes to enemies.

Nickname: Kaz Half-Japanese, half-American Deputy Commander of M.S.F. Personality Contrary to his tough appearance with blonde hair and sunglasses, he has a very jovial and frank personality. Deeply 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 bewildered when the cardboard tank was liked more than expected, wondering if he was the one who was crazy. As Snake's right hand, he possesses not only combat skills but also broad and deep knowledge. He is particularly well-versed in various military-related information, past conflicts, and political backgrounds. He is a womanizer, which once led to a fight in the sauna after being scolded by Big Boss.

Age: Claims to be forever 16 (actually not a teenager) Full name: Paz Ortega Andrade A Costa Rican girl who loves peace. A student of Galvez, studying the peace constitution at the UN Peace University in Costa Rica, which is currently being established. She was held captive by a mysterious armed group that began deploying across Costa Rica. Along with Galvez, she requests the "Soldiers Without Borders" to eliminate the armed group. The name Paz means "peace" in Spanish.

Full name: Amanda Valenciano Libre A female warrior who fought for the revolution of her homeland, Nicaragua, as a member of the Sandinista National Liberation Front (FSLN). After her father, the commander, died in battle, she took over the position of leading her comrades. Chico, also an FSLN warrior, is her younger brother. She is a smoker and prefers cigarettes over cigars. She has disliked mosquitoes since contracting malaria as a child. She smokes to keep them away. She was caught up in the invasion of Central America by the CIA's "Peace Walker Project." During this, she met Big Boss, leader of the Soldiers Without Borders (MSF), and fought alongside him. She looks up to Big Boss as a savior, and through the fighting, she and her FSLN comrades grew significantly as warriors. A passionate revolutionary warrior with a strong sense of responsibility and pride. While she dislikes Huey (Emmerich)'s passive personality, she shows a friendly attitude toward Cecile, who accompanies them.

Real name: Ricardo "Chico" Valenciano Libre Amanda's younger brother A boy full of curiosity. He loves UMAs, monsters, rare creatures, and mysterious phenomena. He hates being treated like a child and wants to join in adult conversations and missions. He moves freely around Mother Base and is well-suited for the role of finding something and causing a stir.

Full name: Cecile Cosima Caminades Occupation: Ornithologist, researcher A woman who researches nature and birds, not a soldier. She brings a sense of normal life and the air of the outside world into the military base of Mother Base. Bright and sociable, but not overly childish. She has a strong intellectual side as a researcher. She becomes passionate when talking about birds and nature and can keep up with Chico's talk about creatures. She is a messy drinker.

Huey Emmerich An engineer involved in the development of ZEKE and other projects. He becomes extremely talkative when it comes to machines and design. He sometimes fails to read the room, but his passion for technology is genuine. He usually carries around blueprints and design documents or stays holed up in the lab. Note Always uses a wheelchair. Do not make him stand.