Cyborg Ninja is a recurring cyborg assassin identity in the Metal Gear series, most famously associated with Gray Fox in Metal Gear Solid. He appears as a mysterious, high-speed swordsman covered in experimental armor, blending stealth, close-quarters combat, and tragic backstory. In the original Metal Gear Solid, he serves as both an intimidating obstacle and a pivotal ally to Solid Snake, revealing key plot details about Shadow Moses, FOXHOUND, and the nature of the cyborg program.