Watari Ninja

The is a small group of missing-nin led by Oki. Most of the members wear masks to hide their identities. However, the members known besides Oki are Hokushin and Nagare.

Background
The group had for a long time wandered from place to place to seek out jutsu to copy. At some point, Oki decided that his clan needed some place to settle. To that end he went to the Land of Birds disguised as "Mōsō", became chief adviser to the land's daimyo, Owashi, and eventually assassinated Owashi.

Plot overview
The new daimyo, Sagi (who was later revealed to really be Sagi's twin sister, Toki), took the guise of the Cursed Warrior in order to avenge her father. Mōsō sent his assistant and the daimyo's childhood friend Chishima to Konoha for help, a task Neji, Naruto Uzumaki, and Tenten are assigned to. After the team of Konoha ninja figured out that the real threat was the Watari ninja, the members Hokushin and Nagare proceed to follow and attack the foreign ninjas. They were both defeated by Kakashi, who had come to assist the Konoha ninja. Naruto defeated Oki with Naruto Uzumaki Barrage. Oki was then handed over to Toki, and Naruto requested that he be forced to repent for what he had done.

Abilities
Despite having "copied" many jutsu, many of the clan's jutsu were just weaker copies of the actual technique. For example, Oki's "Summoning Technique" was activated by a projector. Also, he used strings to make it appear that the enemy was caught in the Nara clan's Shadow Imitation Technique.