Before modern times, the ninja worked secretly in the shadows, and a particularly shadowy figure is the female ninja or Kunoichi. While often portrayed as female spies, we're left with only hints ...

However, the government which no longer fight against foreign spies plans to bring in ultimate fight skills passed on by beautiful and sexy female ninjas.

Metal Gear Solid's Cyborg Ninja is one of the 1998 game's most memorable characters, backflipping all over protagonist Snake with his chiseled exoskeleton and hissing haunting musings about life.