Twelve Guardian Ninja

The were a group of twelve elite warriors, who left their village and pledged their lives to protect the Daimyo of the Land of Fire. The members are identified by the marked loincloths they wear. It would seem that some time, before the group was disbanded, some underground organization put a bounty on most of the members. Sora had dreamed of being part of this group. Shikamaru received an invitation from the Daimyo of the Land of Fire to become one of his guards. If he had accepted he would have been on the way to becoming one of the Twelve Guardian Ninja.

Background
A group formed before the start of the story, the Twelve Guardian Ninja have for a long time protected the Daimyo. All the original members are dead, but the group stayed alive.

However about ten years before the start of the story, half of the original members began to believe that only the Daimyo should lead the Land of Fire and planned a coup d'etat against the Hokage, and later conquer the rest of the countries. Kazuma tried to remove the Daimyo to replace him with a puppet Daimyo, since the Daimyo didn't support the revolting guards, but he was stopped by Asuma. The ideals split the group in two which led to a fight between them, where only Asuma Sarutobi, Kazuma and Chiriku survived.

Fire Temple Filler arc
In the anime filler arc it is revealed that another one of the guardsmen, Kazuma, survived the fight between the two groups. Staying true to his thoughts, he decided that the Land of Fire only needed one king and tried to annihilate Konoha, only to be stopped by and later been killed by Asuma.

Hidan and Kakuzu arc
During the Hidan and Kakuzu arc, Hidan and Kakuzu went to the Fire Temple to search for the Jinchuriki only to fight Chiriku one of the twelve ninja guardians. Chiriku proved to be formidable but still was defeated and killed by Hidan, Kakuzu later cashed in his body for his bounty of 30 million ryo.

Later at the bounty station Hidan was ambushed by Team Asuma only to surprise the Team by showing them he was immortal. During Hidan's battle with Asuma he ingested some of Asuma's blood and activated his curse that any damage inflicted on him would be inflicted on his opponent. Although the combination of Asuma and Shikamaru was formidable and Asuma even managed to cut off Hidan's head he still survived. After Kakuzu stitched him up Hidan later inflicted more damage to Asuma and finally fatally injured Asuma by stabbing himself in the chest, killing Asuma.

Members
All the known members are deceased.
 * Kazuma
 * Kitane
 * Nauma
 * Tou'u
 * Seito
 * Asuma Sarutobi
 * Chiriku