Hanzo

Hanzou was a legendary ninja who was the former leader of Amegakure. He was very security-conscious, being guarded twenty-four hours a day and having anyone who wanted to see him thoroughly searched. He became famous around the time of the Second Great Ninja War. Little is known of his abilities aside from his riding on the head of a giant salamander (presumably a summon), but he was so powerful that he with his summon fought off all three Sannin. After their battle, he was so impressed with their strength that he decided to leave them if they agreed to accept the title of Konoha's Legendary Three Ninja.