Ninja Hero (4th Edition)

From the back of the book: Ninja Hero is the martial arts sourcebook for the HERO System, and is equally useful for heroic and superheroic campaigns. It includes martial arts from Aikido to Wrestling--and everything in between. Extensive guidelines help you simulate the feel of martial arts movies and comics. Use Ninja Hero to spice up the martial arts in an existing game, or provide the background for an entire campaign based on martial arts.