Akahoshi

is a ninja from Hoshigakure in the Land of Bears. He took over after the Third Hoshikage suddenly "grew ill" and died. In truth, he and his followers Shisou and Yotaka murdered the Third Hoshikage. He thought that with the powers from the meteor, they would compete with the five main countries with it's ninjas to become invincible. When he never told anything about the side effects of the star training, some village ninjas went against him as Natsuhi and Hotarubi try to hide the star.

Some time later, Akahoshi called upon the services of Team Guy and Naruto Uzumaki to help protect the meteor. He later posed as the mysterious masked ninja and managed to kidnap Sumaru to lure out the mysterious bandit to use as bait for Natsuhi. When Natsuhi arrive, she and Akahoshi battled each other as Akahoshi sents Shisou and Yotaka to fetch the Leaf Ninjas. Akahoshi used his Mysterious Peacock Method: Beast to knock Naruto and Natsuhi into the Valley of Death...which they managed to secretly get out of using the Mysterious Peacock Method: Wings. Akahoshi told Neji Hyuga that Naruto got in the way and that their mission is over.

Akahoshi's true colors were shown to the Leaf Ninjas when Rock Lee and Tenten find Sumaru in his quarters hospitalized and rescued him. later Naruto and Natsuhi tracked them down by tracking her chakra trail. Akahoshi claimed the meteor after using Sumaru to force Natsuhi to surrender it. Akahoshi later laid a trap at the Star Training Building the which resulted in Natsuhi's death.

Akahoshi later gave orders to the adult ninjas to eliminate Sumaru, Hokuto, and the Leaf Ninja Shinobi at first sight. Akahoshi later had the adult ninjas fire arrows at the Star Training Building that Sumaru was mourning Natsuhi in. Upon Hokuto and Mizura exposing the side-effects of the Star Training, the adult ninjas turned against Akahoshi. Akahoshi proclaimed that he was the Fourth Hoshikage and planted the meteor in his chest to get the meteor's ultimate powers. None of the ninjas could defeat him until Naruto used the Rasengan to destroy the meteor and defeat Akahoshi with the help of Natsuhi's ghost who was able to save Sumaru. Though he is a prisoner in his own village, Tsunade mentioned that he, Shisou, and Yotaka will be subjected to severe punishment....which is never revealed.

Trivia

 * He bears a great resemblance to Nadare Roga, an antagonist from the first movie.
 * His name means "red priest / monk" ("aka" meaning "red" and "hoshi" means either "priest" or monk").