Raiden

The leader of the Sanmenken and master of Daiou Jouryuu taijutsu, the oldest form of Chinese Kenpo in history (fictional). He has a tattoo of Daioujou (大往生) on his forehead. Uses knived shoes and fights with three monkeys later. He fights J in the Daiyon Kyousatsu 1st Assault Shakumyaku Ioukan (灼脈硫黄関, Scorching Sulfur Vein Ring). At first his taijutsu overwhelms J, but J ends the match in a draw with one of his Mach Punches. After this he enrolls in Otokojuku with Date and the other Sanmenken. He is very serious and loyal but has occasioanly shown a comical side. He is always training in all forms of Kenpo, and therefore can usually recognize and explain all enemy's techniques or identities.
(source : Wikipedia)