Rokushiki

Rokushiki (六式 Rokushiki, literally meaning "Six Styles") is a special, superhuman martial arts style. This style of use had been first introduced by Marine Captain  Fritz.

Overview
The strength of a Rokushiki user is measured by Doriki, which some people can use "Te-awase" to calculate with. The higher the level, the stronger each technique's potency becomes. Most of the users have their own variation of each technique, to increase their versatility and originality. Also, certain users tend to be more specialized in one technique. Rokushiki is the main style of combat for the World Governments's secret CP9 agents, but some  Marines have also demonstrated its usage. It is unknown exactly how much Rokushiki is spread around the Marines.

Trivia

 * Ironically, Rokushiki has been introduced not by the CP9, whom are said to have invented and use the style the most, but rather by the select Marines that have somehow obtained knowledge on how to use it.