Most characters in the game are modeled after historical figures or famous people.
- Hanzo is based on Hattori Hanzo (1541-1596) , a feared Japanese ninja from the Tokugawa Era who was called "Devil Hanzo";
- Dragon is based on Bruce Lee (1940-1973), a famous Chinese martial artist;
- Janne is based upon Joan of Arc (1412-1431), a female French commander who was executed for being a heretic;
- J. Carn is based upon Genghis Kahn (11??-1227), leader of the Mongols and conquerer of Asia;
- Muscle Power is based upon Hulk Hogan (1953-), a very famous US wrestler, and a fifteen-time wrestling champion in various circuits;
- Rasputin is based upon Grigori Yefimovich Rasputin (1869-1916), also known as the Mad Monk, believed to be a psychic and a healer, who had a high influence over the Tsar Nicholas II and his family.
- Brocken, on the other hand, seems to be based upon a Nazi soldier from WWII Germany. His uniform resembles that of a high-ranking Nazi officer.
- It is not known if Fuuma is based upon a real ninja clan or if he was just made up for this game.