The Seven Ninja Swordsmen of the Mist (霧の忍刀七人衆, Kiri no Shinobigatana Nananin Shū) is an organization 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.
As stated in the weapons section, Only swordsmen of the mist can have weapons of S-rank.
They also must have kenjutsu as a specialty, only people aligned with mist are allowed to become swordsmen
If you become a missing nin, you are no longer a swordsmen, your are simply a missing ninja.
In order to replace someone as a swordsmen, you must first either kill them if they are still in the group. If they have defected, it is up to your kage to either just let you fill the position, or force you to kill them and take their sword.
You must be at least of A rank to be in contention for the seven swordsmen.
After a swordsmen death new members are completely up to the current kage, but once a member is added, the kage cannot remove them.
The swordsmen control everyone in the village except for the kage, kind of like anbu
There will be one specific swordsmen in control of all the others, chosen by the village kage
Each swordsmen will have a seal that increases chakra by 10% with the leader having one that increases chakra by 15% once they defect from the village, this seal WILL go away.
The last condition is mainly to keep people from joining just to get the weapons then leaving. There is something to keep you there.
List:
Leader: Shin Megami
Member List: .Zane-kun, Nishashi Kamon