Seven Ninja Swordsmen of the Mist

The is an organisation consisting of only the greatest blade wielding shinobi of their generation that Kirigakure can produce. There can only be seven members at a time — hence the name. The swords of the Seven Swordsmen are passed down from generation to generation.

History
At some point Fuguki Suikazan, Jinin Akebino, Kushimaru Kuriarare, Raiga Kurosuki, Jūzō Biwa and two other members of the seven swordsmen corned three Konoha genin. The genin were later saved when Might Duy arrived and acted as a decoy while they escaped by using the Eight Gates Released Formation. The fate for most of the members afterwards is unknown, but at least Fuguki and Raiga survived the fight.

Years later, when Fuguki was caught leaking classified information outside of Kirigakure, his apprentice Kisame Hoshigaki killed him and took Samehada from his corpse, which resulted in him joining the group afterwards. The Hōzuki brothers, Mangetsu and Suigetsu, both trained with the intention of joining the Seven Ninja Swordsmen together. Mangetsu did eventually join, and mastered use of all seven of the swords. However, he later died, and Suigetsu was captured by Orochimaru. At some point, Kisame committed several unauthorised assassinations and attempted to overthrow the government, which lead him to becoming a missing-nin and joining the Akatsuki.

Zabuza Momochi attempted a coup d'etat and to assassinate the Mizukage but failed, which lead to he and the Demon Brothers defecting from the village and taking his Kubikiribōchō with him. After being labelled as a missing-nin, hunter-nin were dispatched to find and kill him. In the anime, during one of his Anbu missions, Raiga encountered a boy who he sympathised with and decided to leave the village, taking Kiba with him. Through out the years, the numbers of swords in Kurigakure's possession decreased to the point that only Hiramekarei was left and passed onto Chōjūrō, who served as the groups only active member.

Following Suigetsu being freed, he began hunting down the swords to fulfil his dream of reforming the group and becoming its leader. He collected the Kubikiribōchō from Zabuza's grave and joined Hebi, with the likely chance he would cross paths with Kisame and take Samehada. Following the Fourth Shinobi World War being announced, Kisame confronted the Eight-Tails jinchūriki and in the process, Samehada abandoned him for Killer B's immense amount of chakra. Shortly after, Kisame committed suicide to protect Akatsuki's secrets.

At the start of the war, Kabuto Yakushi had Zabuza reincarnated alongside other famous shinobi to fight the Allied Shinobi Forces on Akatsuki's behalf. When he and his group encountered the Third Division, Zabuza used his signature technique to conceal his groups presence. Before the division could get the upper hand, Kabuto had Gari and Pakura summon the previous six swordsmen of the strongest generation. Mangetsu then used his scroll to summon four swords to begin their groups attack. By the second day of war, all the reincarnated swordsmen had been sealed. Later with the release of the Impure World Reincarnation technique, the swordsmen souls returned to the afterlife.

Swords

 * A giant sword with a butcher-knife-like appearance, the wielder can use the semi-circle on the blade to decapitate an opponent's head, hence the name. The sword has an ability to regenerate using the iron absorbed from the blood of those it cuts down. It is also called a.
 * The most terrifying of the seven blades, it has the appearance of a giant knife covered in shark scales. It is a sentient, living weapon and has the ability to "eat" chakra. It is also called a.
 * A sword in the shape of a needle with a long thin wire that resembles thread attached to it, which can be used to pierce enemies and "sew" them together in human bundles. It is also called a.
 * A sword consisting of a single sided axe and a hammer joined by a length of chain. Said to be capable of crushing any and all defences. It is also called a.
 * A sword that has a scroll full of explosive tags incorporated into it, lined up behind the blade, combining swordsmanship and explosions. It is also called a.
 * Twin swords that are imbued with lightning which increases their cutting power. They are said to be the sharpest swords ever forged. They are also called.
 * A bandaged double-handled sword that is capable of storing and emitting the user's chakra which can then take on various forms. It is also called a.

Known Members
An earlier generation of the organisation consisted of Fuguki, Jinin, Jūzō, Raiga, Kushimaru and two other unidentified shinobi:


 * Hiramekarei's wielder: A shorter individual with moused-up hair who wore his forehead protector as a choker and a utility belt around his waist along with a flak jacket and a pinstriped shirt and pants. He carried the Twinsword strapped to his back horizontally.
 * Shibuki's wielder: A slender man who wore a pinstriped shirt and a cloth-mask that only showed his eyes.

Trivia

 * It seems to be a tradition for the members and aspiring members of the Seven Swordsmen to have sharpened teeth.
 * All the known named members also have fruit-derived surnames, or if lacking a surname, their given name. This does not hold true for Raiga.
 * All of the reincarnated swordsmen have bandages around their necks.
 * At least three of the members became missing-nin, while one was discovered to be a traitor, leaking confidential information to other villages.
 * Although Mangetsu was said to have mastered use of all the swords, other members of his generation wielded six of them, leaving Hiramekarei as the blade he likely primarily used.
 * Three members of the Seven Swordsmen were former Anbu members.
 * Three members of the Seven Swordsmen managed to fake their own deaths or regain life later on, by the means of an accomplice.
 * In the anime, Kushimaru and Jinpachi were known collectively as the due to their many acts of cruelty in their lifetime.