Rei

Rei Ray in Vizs English manga is the successor of Nanto Suichouken which is said to be the most elegant of the Nanto Seiken styles. He represents the Star of Justice. Rei is introduced in the manga as a ruthless chauvinistic mercenaryforhire of shifting allegiance whose sole purpose is to kill the man with seven scars whom he believes was responsible for kidnapping his sister Airi. Rei is hired alongside Kenshiro by Mamiya to protect her village against the Fang Clan. After Airi is found and rescued by Ken Rei becomes Kenshiros closest ally and supports him for a few story arcs. Source: Wikipedia