Aoi Rokushō

appeared as a minor character in the Naruto anime. He was a Jonin from Amegakure, and a Missing-nin from Konohagakure.

Background
A former instructor in Konoha, he convinced Idate Morino, his former pupil, to steal the legendary lightning chakra sword called the Sword of the Thunder God, which had once belonged to Tobirama Senju, the Second Hokage, along with a forbidden scroll. Idate was tricked into believing that this would grant him advancement to Chunin. Once the sword was in Aoi's hands, 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 with them, Aoi had the ANBU killed, and Ibiki ended up captured by the Rain Ninjas, where Aoi then tortured him to read the scroll. Idate escaped under Ibiki's advice as Aoi attacked Ibiki; Ibiki escaped as well. Aoi then 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 to make sure that Fukusuke Hikyakuya won the race. If Idate had lost, Jirocho Wasabi and the Wasabi Clan wouldn't have controlled the Land of Tea any longer. 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 by calling him the weakest Uchiha member, before striking and knocking him out with the sword. However, Naruto Uzumaki was able to strike Aoi with the Rasengan (which also managed to break the Sword of the Thunder God), which sent the ninja flying off a cliff into the water and rocks below. His fate is still unknown.

Trivia

 * means blue/green, and means copper rust.
 * He is the only Rain Ninja so far in the series to have a surname.
 * He also made an appearance as a boss battle in the Xbox 360 video game Naruto: The Broken Bond.
 * He and Mizuki share similar traits: Both appear friendly to better deceive others. They both tricked their "respective" students (Naruto Uzumaki and Idate Morino) into stealing an item in order to "promote" them. Naruto: the forbidden scroll to becoming a genin and Idate: the Sword of the Lighting God and a forbidden Scroll to become a Chunin.