Cyborg

Cyborgs are humans who have fused their organic bodies with machinery. The machine components are different from prosthetics, as they not only substitute the replaced body parts, but also perfect them. The most well known cyborg type are the Cyborg Ninjas, although there are other types

It was rumored in the late 1990s that Big Boss became a cyborg due to injuries sustained at Outer Heaven via the Snatcher project, although the rumors have not been confirmed.

During Liquid Ocelot's insurrection against the Patriots in 2014, Liquid Ocelot utilized a mechanical prosthetic in place of Liquid's arm, having removed the latter to restore stability to his psyche. The arm left him with enough strength to leave a dent on Outer Haven's hull. After the Patriot's fall, cyborg technology development ran rampant across the globe. This led to various soldiers and personnel adopting mechanical characteristics. One soldier noted that one cybernetic enhancement developed during this time, a saintude muscle fiber, amplifies the user's limb strength to be comparable to a jackhammer. In addition, several cyborgs during this time utilized electrolytes to enhance their strength, which is often gained by "extracting" fluids. The leader of an unidentified African nation had bodyguards that were mostly cybernetic.