Motoi

is a long time friend of Killer B and the Kumogakure ninja that is stationed on the island. He guides Naruto Uzumaki and Yamato through where Killer B trained to control the Eight-Tailed Giant Ox.

Background
When Motoi was five-years-old, he and Killer B were good friends. After Motoi's father was killed extracting the Eight-Tailed Giant Ox from its previous jinchūriki, Motoi came to hate the Eight-Tails. B was soon chosen to be the beast's next jinchūriki and Motoi, just as many other Kumo villagers did, focused his anger towards B. He once tried to assassinate B to avenge his father, but was disarmed by B easily. Despite having his face covered, Motoi assumed that B knew it was him, as B ungrudgingly greeted him as they used to. After this, Motoi could never bring himself to face B, and hadn't spoken to him for thirty years, but in time he came to admire B as a village hero.

Appearance
Motoi greatly resembles his father with his dark, spiky, black hair and dark eyes. His most prominent feature is the black mark that runs down the bridge of his nose. He wears the standard outfit of a Kumogakure ninja, complete with hand guard, shin guards and flak jacket. He also wears a scarf around his neck.

Abilities
Motoi apparently is an expert tracker-nin, claiming after Kisame was discovered, that even with his skills it would be nearly impossible to find Kisame if he left the island. He can also summon owls.

Confining the Jinchūriki Arc
Motoi greets Naruto and his Konoha escorts when they are brought to the island and takes them to their lodgings. After arriving, Naruto tries to get B to train him in controlling his tailed beast. B refuses, so Naruto comes to Motoi for help with convincing B, claiming that he is too stubborn. Motoi grows angry with Naruto for insulting him and insists that B must have a good reason. He takes Naruto to the Falls of Truth and instructs him in how to use it, explaining that it will reveal why B has misgivings.

Naruto meets an evil version of himself that he cannot defeat. He requests Motoi to ask B how he defeated his inner demons, but Motoi says that he is in no position to ask anything of B, having once tried to kill him. He tells Naruto about B's past and Naruto leaves to think. Motoi is later attacked by the giant squid that lives near the island, but B saves him. He apologizes for trying to kill B when they were kids, but B reveals that he holds no grudge and forgives him, lifting his fist. Motoi sheds a tear as he realizes B is still his friend, and they bump fists. After Naruto beat his dark self, Motoi left the group to report back to Kumogakure.

Motoi later leads Might Guy and Aoba Yamashiro to the falls (after much urging on Guy's part), where he explained the falls and told them that Naruto had already passed this stage. They were later confronted by Kisame Hoshigaki emerging from the other side of the falls, whom Guy thought to be his "inner self", but Motoi, realizing it wasn't attempted to warn Guy that it wasn't.

After both Aoba and Guy mistake Kisame for an inhabitant of the island (a giant blowfish) he expresses his exasperation that they could still be making such dumb misunderstandings. He later warns them that they should restrain Kisame before he gets outside the island's barrier which would make it difficult even for him to track him. He then apprehended Killer B correcting him about the direction Kisame went. After retrieving the scroll they attempt to veify the information that Kisame had collected and he along with the others fall victim to Kisame's booby-trapped scroll, and a shark summon escapes with the scroll with all the intelligence Kisame gathered.

After Killer B is unable to catch the shark that escaped, Motoi summons an owl to send word to the Shinobi Alliance of the breach. He also puts Aoba's worries to rest by assuring him that the enemy would not be able to find the island because it could move. When the Manda II finds the he detects it first that the barrier has been breached and they have been found, later he convinces Yamato to keep his cool and let Naruto believe that the attack on turtle is just an earthquake.

After Kabuto lands on the island, he along with Yamato and Aoba, go out to defend the jinchūriki. After Yamato's capture and Kabuto's departure, he remarks that he can no longer sense them and tells the Tsuchikage that they had captured Yamato.