Raiga Kurosuki

is a former member of Kirigakure's ANBU and Seven Swordsmen of the Mist, though he apparently disliked all of the other members.

Background
While he was still loyal to Kirigakure, Raiga met Ranmaru, a disabled boy who came to act as additional eyes and ears for Raiga in exchange for being carried upon his back in a case while the rest of Raiga was under a hooded robe. Ranmaru would become the only person Raiga cared about, despite Ranmaru's pacifist nature and Raiga's love for battle.

When Raiga had enslaved a town and forced it's villagers to work in it's mines, he assembled some followers (including Karashi) to form the Kurosuki Family. Besides him, his followers wore a hooded robe, gloves that sprout claws from the back of the hand, and enforced his laws. Should a law of his be broken, that person would end up being buried alive funeral style.

Raiga arc
When it came to his latest one of Rokusuke, his group ran afoul of Naruto Uzumaki, Rock Lee, Neji Hyuga, and Tenten. He later engaged them using a mist jutsu that negated Neji's Byakugan. While unconscious from one of Raiga's attacks, Rock Lee manages to fight him off despite this. When Naruto asks if he knows Zabuza Momochi and Kisame Hoshigaki, Raiga stated that he hated those two. He was apparently defeated by Naruto's Rasengan.

When Karashi brought Ranmaru to where Raiga's body was, his energy awakened Raiga whom thought Ranmaru died trying to revive him. When Tenten arrived, she fought Raiga but was defeated. Raiga then had Karashi lure Naruto, Rock Lee, and Neji to where he is. Raiga manages to trump the three until the curry Tenten and Karashi fed them enabled them to be able to fight him again. When Ranmaru acts on his beliefs and tries to convince Raiga to stop fighting, Raiga feels betrayed. Upon being knocked off a cliff by Naruto Uzumaki, Raiga kills himself in midair with one of his own bolts of lightning.

Abilities
As one of the Seven Swordsmen, Raiga wields two spiked swords that he uses in a manner similar to lightning rods to attract and channel lightning and electricity. He can connect them at their hilts to form a larger double-bladed sword, effectively increasing the weapon's size and allowing him to perform different and more powerful attacks. Lightning acts as a power source for him, and so long as he has access to it he can battle continuously.

Behind the Scenes
Raiga is an anime-only character, and was installed during the filler sequences leading up to Shippūden.