Guillermo Garcia leads the paramilitary Armistice Guards (Peace Monitoring Group) while also serving as a professional negotiator hired by the Tibet-Himalaya United Kingdom government to mediate regional conflicts. He publicly portrays himself as a stabilizing force working to bring peace to war-torn areas. In appearance, Garcia is a male in his 50s with average height and build, bald, and wears corrective lenses. He is typically seen in military attire but occasionally wears civilian clothing. Garcia's personality starkly contrasts his public image. Outwardly benevolent and diplomatic, he is revealed to be cunning and deceptive. He secretly orchestrates conflicts by covertly supporting opposing factions, including funding attacks on civilians to create chaos. Once tensions escalate, he positions himself as the mediator to "resolve" the crises he engineered, charging substantial fees. This cycle enriches him and his group while cementing his heroic reputation. He shows no remorse for lives lost and eliminates anyone threatening his operations, like killing his associate Jean-Marcel Belmondo over a financial dispute. Garcia operates in volatile regions like the Tibet-Himalaya United Kingdom, leveraging ongoing civil wars for profit. Many view him as a peacekeeping hero due to his visible interventions, while others recognize him as an opportunist and cold-blooded killer. His group recruits from disbanded United Nations peacekeeping units, though most members remain unaware of his true agenda. His relationship with Shinya Kogami begins cordially; they meet when Garcia intervenes in a bar fight involving Kogami. Garcia offers logistical assistance, including transportation, while probing Kogami’s motives. This dynamic fractures when Tenzing Wangchuck, a young girl training under Kogami, witnesses Garcia collaborating with Belmondo—the mercenary responsible for her family’s massacre. After Garcia murders Belmondo, he attempts to silence Tenzing by critically injuring her with a thrown knife, exposing his true nature to Kogami. Garcia then orders both witnesses eliminated. Garcia’s scheme culminates during peace talks he orchestrated. After the talks conclude, he attempts to flee via train. Kogami, aided by defectors from Garcia’s group like Tshering Gurung, intercepts him. During their confrontation, Kogami kills Garcia using his own knife—the weapon that injured Tenzing. Garcia’s death is subsequently framed as the act of a villain to preserve the fragile peace, though regional governments privately acknowledge his role in perpetuating the conflict.