Aoi Rokushō

appears as a minor character in the Naruto anime. He is a Jonin from Amegakure, and Missing-nin from Konohagakure in the Naruto series. He also makes an appearance as a boss battle in the Xbox 360 video game Naruto The Broken Bond

Background
A former instructor in Konoha, he convinced Idate Morino to steal the legendary lightning chakra sword called the Sword of the Thunder God which once belonged to Tobirama Senju, the Second Hokage, and a forbidden scroll. Idate was fooled into believing this could grant him advancement to Chunin. Once the sword was in his hand, he fled the country with Idate who was ashamed of his actions and they went to Amegakure. When Ibiki Morino and two ANBU members caught up to them, Aoi had the ANBU killed and Ibiki ended up captured by the Rain Ninjas where Aoi tortured him to read the scroll. Idate escaped under Ibiki's advice as Aoi attacked Ibiki. Though Ibiki escaped, Aoi managed to become a Jonin of Amegakure.

Land of Tea
Aoi and Team Oboro were hired by Kirouku Wagarashi of the Wagarashi clan to prevent Idate from winning the Todoroki Shrine race and make sure Fukusuke Hikyakuya wins the race. If Idate were to lose, Jirocho Wasabi and the Wasabi Clan would no longer control the Land of Tea. When Team 7 was hired to protect Idate, they were able to confront Aoi and the three Rain Genin: Oboro, Kagari and Mubi. Aoi dodged Sasuke Uchiha's Chidori and briefly belittled him as being the weakest Uchiha member before striking and knocking him out with the sword. But Naruto Uzumaki was able to strike Aoi with a Rasengan (which also managed to break the Sword of the Thunder God), and send the ninja flying off a cliff into the water and rocks below. His fate is unknown.

Ironically, his last words to Sasuke before his possible death caused the young Uchiha to abandon Konoha seek out the rogue Sannin Orochimaru for greater power to kill his brother (it was not Aoi's harsh words that made Sasuke leave in the manga).

Trivia

 * means blue/green, and means copper rust.
 * He is the only Rain Ninja so far in the series to have a surname.
 * He is the only known character with all vowels in his name.