福山潤
, also known as , the and , was a high-ranking agent of FOXHOUND. First appearing in the original "Metal Gear" games, he goes missing during the original game with his last transmission being a cryptic message simply saying "Metal Gear", and returns as an enemy in "". In "Metal Gear Solid", he is revived from death as the Cyborg Ninja to confront and aid Solid Snake several times before finally being killed by Liquid Snake via Metal Gear REX. In the Japanese version, the Cyborg Ninja is voiced by Kaneto Shiozawa (in "Metal Gear Solid") and by Takumi Yamazaki (in "Metal Gear Solid: Digital Graphic Novel"). In the English translation, the Cyborg Ninja is voiced by Greg Eagles (in "Metal Gear Solid") and by Rob Paulsen (for "Metal Gear Solid: The Twin Snakes"). Null is voiced by Jun Fukuyama in Japanese and by Larc Spies in English.