Skull Face

Skull Face is the primary antagonist of Metal Gear Solid: Grounds Zeroes and is the commander of XOF during the 1970s.

Past
Skull Face (real name unknown) was from from a village which had a factory, which was where his parent's worked However, one day, an aircraft destroyed the factory under the pretense of it secretly developing weapons (specifically repairing them), as stated by various spies. Although he and the workers tried to escape, a huge crowd of people blocked him, and he was eventually kicked in the stomach. He would hear his name called when the factory was demolished, and upon being taken to a hospital, he heard, in what was ultimately his final recalled instance of his mother tongue, a nurse stating that he really needed to be put out of his misery in a tone that indicated that she frequently said this towards her patients.

By this point, most of his prior identity had been stripped, which resulted in the nihilistic philosophies that he eventually adopted. His already deformed features, which resulted in him being virtually incapable of feeling pain, were worsened later on when he was tortured by foreign hands. At some point, he relayed his backstory to a prisoner that he attempted to recruit to his side. He at some point met Zero and Big Boss under undisclosed circumstances, outside of his eventually wanting revenge on them both.