Kakkou was a shinobi from Iwagakure who fought and died during the Third Great Shinobi World War. He excelled in all shinobi abilities, from ninjutsu, to taijutsu, to genjutsu. This made him a highly influential and powerful figure in Iwagakure.

He was highly belligerent and had great experience in battle, allowing him to use advanced tactics to defeat his enemies. He fought using blades attached to his arms. He used his skills while fighting Team Minato, led by Kakashi Hatake. First he tried to extract information from Rin using genjutsu, but this proved unsuccessful. Later when Kakashi and Obito Uchiha attempted to rescue Rin, Kakkou managing to corner them and even kill Obito. However, once Kakashi had received the Sharingan, the tides turned and he was killed by Kakashi's Chidori, but not before Kakkou cut in two the famous White Light Chakra Sabre Kakashi had inherited from his father, Sakumo Hatake.

(Source: Narutopedia)