The Ninja Master, or simply known by the "Masked Ninja", is the evil leader of the crime syndicate Neo Zeed, and the main antagonist in The Revenge of Shinobi. He attacks Joe Musashi with his long hair and uses it as a boomerang also.
Nakahara was once the mentor of Joe Musashi, but he had another persona; the Masked Ninja in charge of the Zeed Crime Syndicate. He had his soldiers kidnap the children of the Oboro Ninja School, prompting Joe to save them. His plan was to reignite the feudal wars that the ninja were active in so that the Ninja could have a second chance at glory, but he was defeated by Joe.
The Masked Ninja returned as the leader of the criminal organization called Neo Zeed. He appeared in the last level where Joe confronts him in a final showdown. The Ninja Master trapped Joe's bride, Naoko in a cell trap where it can kill her. Joe defeated the Ninja Master and rescues Naoko and reunites with her.
- The Ninja Master in the bottom picture is Nakahara from the first Shinobi game, the one with similar hair in Shinobi III is not Nakahara, it is a boss named Byakushishi.