Kusuna

was a shinobi who hailed from the Land of Demons.

Plot overview
Kusuna was Yomi's second-in-command of their team in their quest to destroy Shion and to release the demon, Mōryō. Before the mission began, Kusuna was infused with Yomi's dark medical ninjutsu so that he could act as a catalyst for his team. After plowing through the temple's defenses, Kusuna and his team confronted Shion and prepared to kill her, but were stopped by Naruto. His sudden arrival and production of a large amount of Shadow Clones drove them back, until Kusuna ordered Gitai, Setsuna, and Shizuku to use their multi-element combination to get rid of Naruto. After Neji, Sakura, and Lee showed up to save Naruto, however, Kusuna had his team make a diversion while he went after the fleeing Shion.

Kusuna caught up with Shion, but, before he could land the killing blow, Neji grabbed hold of him and blasted him into a wall. Seeing that the odds were against him and that he wouldn't have an opening to replenish his team's chakra, Kusuna fled along with his team.

Later, after formulating a new strategy, Kusuna and his team attacked again, working to separate Naruto and the others from Shion. As the plan seemingly worked, with each of Shion's bodyguards being forced to fight separately, Kusuna chased after Sakura, who was holding Shion. Kusuna caught up with Sakura and incapacitated her before going after Shion. With his target now alone, Kusuna took the opportunity to kill her, unaware that he had actually killed Shion's bodyguard, Taruho, who had disguised himself with a special transformation jutsu.

After learning from Yomi that Shion was still alive, they returned to finish the job. While going out to find Shion, and destroying the forest to do so, Neji correctly deduced that Kusuna was the reason for their opponents' unusually high prowess in multiple elements. After tricking Kusuna's team to use up their dark chakra, Neji ambushed Kusuna and unleashed his Eight Trigrams Sixty-Four Palms, taking away the enemy's main source of power and thus finishing off Kusuna.

Abilities
As a medical ninja, Kusuna's main duty in battle was to support. Unlike regular medical-nin, his primary goal was to enhance his team rather than to heal them. He could also use his medical ninjutsu to effectively battle and kill his opponents.

He has shown to be a capable strategist, repeatedly being able to fool his enemies with various misdirections and combo attacks. Also being the second in command, Kusuna has also shown to be a capable leader and tactician. During the surprise attacks, he can quickly asses the situation at hand and effectively direct his team into a well-thought out counter-attack.