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Towards the end of the second test of the Chuunin Exam, Kagari and his teammates use an illusion technique to cause Naruto, Sasuke, Sakura and Kabuto to walk around in circles and waste their time. When the group discovers the deception, the Rain Genin begin to attack the group with bunshin clones. From a hidden view point above, the Rain Genin are able to control the clones and launch kunai at the group below. Naruto decides that if all the clones are attacked at one time, the location of the Rain Genin will be revealed. Naruto then uses his Kage Bunshin and proceeds to fight the clones all through the night. By the next morning Naruto and the group are exhausted so the Rain Genin decide to reveal themselves and strike. Naruto held one more trick up his sleeve, the version of Sakura, Sasuke and Kabuto that were along with him here Kage Bunshin clones of his using the transformation technique. Standing behind the Rain Genin, the real Sasuke, Sakura and Kabuto then reveal themselves. Not expecting that revelation, the Rain Genin are momentarily unsure what to do. Sasuke tells Naruto that he can rest now, but Naruto does not want to show weakness in front of Sasuke. Striking quickly, Naruto punches all three of the Rain Genin.

Taking one last stand, the Rain Genin Oboro uses a mist clone technique to create multiple clones of his Genin team. Naruto states that one must be the real version so he begins to attack the clones. Passing through them Naruto is unable to find any real physical bodies. Sasuke uses his Sharingan to see that none of the clones in front of them are real. Seeing Kabuto and Naruto off guard, the real Rain Genin rise from the ground and attack Kabuto. Kabuto is injured and they are surprised when they see Kabuto show a great deal of power behind his anger at being hurt. Using the opening Naruto then kicks all three of the Rain Genin and knocks them unconscious. Having their scroll taken by Naruto's team, Kagari and his teammates do not pass the second test of the Chuunin Exam.

After the Chuunin exam the Rain team resumed Genin work. With the Jounin Aoi, they accepted a mission to aide the Wagarashi family in winning the Todoroki shrine race held in the Tea Country. During this period, the whole team furthered their skills and learned the Mizu Bunshin ability. Kagari learned the Black Clouds Technique. While Oboro went to stall Idate, Kagari and Mubi prepped a ship for naval combat. After sinking Idate's ship, the Rain Genin went to battle Team 7 underwater, where they held the advantage. However, Naruto used his Rasengen training to hand them another humiliating defeat.

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At some point in the past Kimimaro's body was badly damaged. Orochimaru had looked to Kimimaro as a potential body to act as his new vessel. Kimimaro was very appealing in this manner because of his bloodline ability to manipulate the bones in his body. Unfortunately his health problems forced him to remain unused. When Uchiha Sasuke was being brought to Orochimaru, Kabuto worked on Kimimaro so he could help them in their cause. Through sheer force of will Kimimaro was able to recover himself enough to do Orochimaru's bidding once again.

When he was able to move again, Kimimaro left Orochimaru's compound to face Uzumaki Naruto. Naruto used his Tajuu Kage Bunshin technique but Kimimaro was able to destroy all of the clones. The situation looked dire but Rock Lee appeared to lend assistance. Naruto left the fight behind as Lee tried to fight the Sound ninja. Using his bone spikes Kimimaro was getting the upper hand until Gaara of the Sand arrived to help the Leaf ninja. Gaara and his siblings had been sent by the Fifth Hokage to help. Using his sand techniques Gaara was able to force Kimimaro to use his highest cursed seal form and use his highest Dance technique. When Gaara seemingly killed Kimimaro he and Lee let down their guard. Appearing from behind them Kimimaro was within striking distance to kill the two ninja, however he had pushed his body too far and it finally gave out, ending his life.

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A short time in the past Kaiza saved a young boy named Inari from drowning. Kaiza took it upon himself to protect and teach the young boy about life and protecting those precious to you. Kaiza would go on to marry Inari's mother and act as an important role model for the young boy. When Gatô began to take over the Wave Country, Kaiza tried to stop the corrupt businessman. Unfortunately Gatô used Kaiza as an example. Cutting off Kaiza's arms, Gatô put his lifeless body on display to warn the people of the Wave Country not to try and stop him.

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When Hidden Rock invaded the Grass Country on its path towards Fire, Kakkou served as an advanced guard who scouted the territory for enemy movements. He and a fellow ninja noted the movements of the three man Leaf team consisting of Hatake Kakashi, Uchiha Obito and Rin. Seeing the opportunity to gather information about their opponent’s movements, they attacked the group and kidnapped Rin. Later the two Rock-nin's used a Genjutsu technique to try and break Rin's will and reveal her mission. When Obito and Kakashi came to save Rin, Kakkou used a Doton technique to cause a cave in to cover the three Leaf ninja. The falling rocks crushed and pinned Obito underneath the rubble. Thinking his opponents dead, he rested and waited for reinforcements to arrive. During this period Obito asked Rin to transplant his left eye into Kakashi's damaged left eye. After the surgery was over, Kakashi emerged from the rubble and used his Chidori to kill the ninja.

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Kakuzu was much older than he appeared, having been one dispatched by his village to assassinate Shodai Hokage. Unfortunately Shodai's Mokuton got the better of Kakuzu, and he returned having failed in his mission. Dispite the challenging nature of his mission, he was stigmatized and punished by his village for the failure. After escaping his imprisonment, he took and used the village's ultimate Kinjutsu Jiongu, which extended his life by withdrawing the hearts of his opponents. He made use of this ability by taking the hearts of the village leaders and leaving his former comrades behind.

Jiongu also allowed him to utilize the chakra nature of the original heart removal victim, granting him access to all five chakra elements. Kakuzu's body was held together by the mysterious black Jiongu tendrils, which sewed together various chunks of his body. These stitches could be removed to allowed him to extend his body parts. After leaving the village Kakuzu partnered with many ninja, usually killing them out of dislike. He eventually joined Akatsuk and partnered with another "immortal" named Hidan. Hidan and Kakuzu were directed to capture the two-tailed bijuu Jinchuuriki Ni'i Yugito. This kunoichi from Hidden Cloud was highly skilled and not easily captured by the pair. The Jinchuuriki seemed to have been assigned as Kakuzu's personally to capture.

After handing off Yugito to Zetsu, Hidan and Kakuzu headed to the Fire Country Temple in search of a bounty head. There Kakuzu and his partner wiped out many of the monks and killed Chiriku, Kakuzu's bounty target. The two men then headed to a bounty station to cash in Chiriku. After receiving his money Hidan and Kakuzu were attacked by a team from Konoha. In the battle, Hidan killed Sarutobi Asuma and the two men were forced to withdraw after being contacted by the Akatsuki leader. They assisted in the withdrawing of the Nibi from Yugito and then sealing it and the Sanbi in the King of Hell Statue.

On their journey to find their second Jinchuuriki, they were stopped by Team 10 and Kakashi. The team was set on revenge for Asuma's death. Shikamaru led Hidan off to fight alone and Chouji, Ino and Kakashi began to battle Kakuzu. Seeing Kakuzu use a Earth element jutsu to harden his body, Kakashi quickly moved to pierce Kakuzu's heart with Raikiri, as Lightning beat Earth. Kakuzu wasn't dead though. He removed his cloak revealing four tendril entities. These entities wore masks and contained the hearts of opponents he had fought. The Earth entity was killed and he began to attack using his other masks. Chouji managed to damage the Lightning mask and Hidan unfortunately damaged Kakuzu's original Water heart with his jutsu.

Kakuzu was forced to absorb the Lightning heart to live and he moved to unleash more Fire and Wind attacks. Naruto and Team 7 arrived to assist and Naruto asked to take on Kakuzu alone, to prove his growth. He moved to attack with his new Fuuton Rasen Shuriken, but it failed. He then tried again, using a clone diversion wielding Rasen Shuriken as well to get access to Kakuzu's blindside. The attack struck home, destroying Kakuzu's hearts and critically wounding him in a maelstrom of destruction. Kakuzu couldn't believe such young people had beaten him and Kakashi told him that to one who fought Shodai, they would be kids. But now Kakuzu was just a beaten old man. Kakashi then finished Kakuzu off with a Raikiri. Kakuzu's body was then taken back to Konoha for autopsy. Tsunade examined his cells to determine the extent of the damage Naruto's new jutsu caused. It is unknown what happened to Kakuzu's body after the examination but Konoha still appears to have held on to it and his ring.

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Izumo and Kotetsu held their own pre-test before the start of the main Chuunin Exam. They used Genjutsu to disguise themselves as Genin and turned away those Genin who came to take the test. Those Genin who saw through their illusion were allowed to pass. Later both Izumo and Kotetsu would watch over the third test and give their feedback on which Genin had the best qualities to make a good Chuunin.

After the Fifth Hokage took office, Izumo and Kotetsu would act as personal assistants to her office. Several years later both Kotetsu and Izumo would take part in the twenty platoons assigned to stop Akatsuki. Both men made up a platoon alongside Nara Shikamaru and Sarutobi Asuma.

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Kankurou is the son of the Kazekage. In the third preliminary matches of the Chuunin Exam, Kankurou is placed against Sound spy Tsurugu Misumi. Utilizing his puppet Karasu, Kankurou is able to surprise Misumi by having Karasu wrap his arms around the Sound spy and crush him. In the third test Kankurou is placed against Aburame Shino. When it was time for his match, Kankurou gave up before the match even started. He became paranoid and was unsure what to do because Gaara's match was delayed. The Sand Genin were under orders to start their plan for the invasion of Leaf by Sand and Sound after Gaara's match. After the invasion began Kankurou helped Gaara escape from the arena to an area where he could rest so he could begin his transformation into the Shukaku demon. Along the way he was stopped by Uchiha Sasuke and Aburame Shino. Shino directed Sasuke to continue after Gaara as he wanted to finally have his match with Kankurou. Kankurou and Shino exchanged blows but Shino was able to overcome Kankurou with his destruction bugs. Later Temari was able to find her injured brother and help him to safety. With the defeat of Gaara by Uzumaki Naruto, Kankurou and his siblings retreated from Leaf.

Months after the invasion and the surrender of Sand, both Leaf and Sand became allies again. After Uchiha Sasuke left Leaf to seek out Orochimaru, Shikamaru and a Genin team left to retrieve him. When Shikamaru and the Genin were in a dire position facing the Four Sounds, Kankurou and his siblings arrived out of nowhere to lend support. They had arrived under the direction of the Fifth Hokage Tsunade who had requested assistance from Sand. Kankurou lended assistance to Kiba and defeated the tiring Sakon and Ukon with ease. Kankurou and his siblings then returned to Konoha with the injured Leaf ninja.

After the time skip, Kankurou advanced in rank to Jounin. When Akatsuki invaded Hidden Sand to capture Gaara, Kankurou tried in vain to fight Akatsuki member Sasori and get him back. Unfortunately, Sasori was the legendary puppet master of Hidden Sand who fled years earlier. Knowing all of Kankurou's tricks, he easily avoided injury and poisoned Kankurou. Kankurou had only three days to live, but the medical skills of Sakura managed to save him in time. He then remained in the village to recover as Naruto and his team attempted to track down Gaara's abductors.

A short time later, he and a large force of ninja from Suna travelled to assist Konoha in retrieving Gaara. They arrived in time to see Chiyo revive the dead Gaara at the cost of her own life. Kankurou silently thanked Naruto for all he had done to save his brother. At some point later, Kankurou stopped by the destroyed Akatsuki based and retrieved the fallen puppet body of Sasori. He removed the chest casket contained Sasori's organic parts and repaired the puppet. He then added it to his arsenal. He later travelled to the Iron Country with his brother Gaara to attend the Kage Summit. When Gaara went to face Uchiha Sasuke, who came looking for Danzou, Kankurou backed his brother up by using Sasori in battle.

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Karin was charged with operating Orochimaru's southern base, located on a small island in the sea. There she made sure Orochimaru's prisoners behaved. She along with Suigetsu were both experimented upon by Orochimaru due to their special abilities. She and Suigetsu had a strained relationship during the times when they interacted.

After defeating Orochimaru, Uchiha Sasuke sought out ninja within Orochimaru's influence to aid him. When Sasuke and Suigetsu arrived to ask her to join their group, she refused. When she got private time with Sasuke, she removed her glasses and seductively said they alone could go on his mission. Sasuke was surprised at her sudden change of mind and when Suigetsu returned, she stated she would not officially join them. Instead she would tag along simply because she planned on go in their direction anyway. She then expressed concern that another individual, Juugo, would soon join their group.

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After Akatsuki seemingly kidnapped the Raikage’s brother Killer Bee, the Raikage ordered Samui and her team to head to Konoha to gather information on Uchiha Sasuke. Little did the group know that Killer Bee had actually avoided capture, and used the opportunity to leave his village. When the Raikage gave his impassioned speech that they had to save his brother, both Omoi and Karui were moved to tears as well.

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Gaara's mother was the wife of the Kazekage. Against her wishes her husband had the spirit of a dead Sand priest imbued into her unborn son. The process of childbirth resulted in her death but before she died she hoped her son would take revenge on those of her village for the horror they had put her through.

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Dan held a dream to become Hokage. When Tsunade voiced her opinion that the ninja squads should start having medical ninja as member of each squad, Dan voiced his support for her idea. Overtime Dan and Tsunade fell in love. As a sign of good luck, Tsunade gave Dan her grandfather's necklace. This expensive necklace had also been given to Tsunade's brother but he got killed in battle the day after receiving it. Tsunade hoped it would prove better luck for Dan. Unfortunately when Tsunade and Dan were in battle, he received critical wounds. Tsunade did everything in her power to stop his bleeding and save him, but it proved useless. Tsunade in the end lost the two men who were most precious to her.

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Katsuyu serves as the personal summon of the Sannin Tsunade. When Orochimaru came to Tsunade asking for her to use her healing abilities, Tsunade refused and a large Sannin and summon battle happened. Tsunade summoned Katsuyu to fight alongside Gamabunta against Orochimaru's summon Manda.

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Years later it was revealed that Akatsuki member Sasori of the Red Sands, the legendary demented puppet master of Hidden Sand had killed Sandaime Kazekage and then turned him into a puppet. Sasori kept Sandaime as his favorite and best puppet, using him against his grandmother Chiyo and Sakura when they came to rescue Gaara from Akatsuki. Sandaime had been made into a puppet using Sasori's "Hitokugutsu" method. This allowed Sasori to use all of Sandaime's jutsu, including his manipulation of the magnetic fields.

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The Kazekage had the spirit of the Shukaku bijuu imbued into the body of his unborn son Gaara. He saw Gaara as a tool that could help the village defeat its enemies. His wife Karura would die with the birth of Gaara. Unfortunately the situation mentally damaged Gaara and the Kazekage saw the experiment as a failure. So he ordered Gaara assassinated. These attempts failed though because the Sand spirit protected Gaara from all harm.

Later during the Chuunin Exam, Hidden Sand formed an alliance with Hidden Sound to invade and take over Leaf. A man in the form of Kazekage arrived at the stadium to watch over the third Chuunin test but it was revealed this was Orochimaru in disguise. Later Sand and Sound were forced to retreat out of the Fire country. It was then the surviving Sand ninja learned the truth. Kazekage had been dead for some time, killed before the start of the Chuunin Exam itself. The actual Kazekage had never agreed to invade Leaf. It had been Orochimaru posing as the Kazekage the whole time, secretly manipulating them to his own ends. Hidden Sand would later select his son Gaara as Godaime Kazekage.

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Kidoumaru's body has the ability to create kumo-nenkin (golden spider thread) from both his pores and his mouth. After he emits the thread, he can use it to form webbing, daggers and bows & arrows. He also has the ability to summon a giant spider and lesser spiders. During the invasion of Leaf Village by Sound and Sand, Kidoumaru served as one of the corners of the barrier which contained the battle between Orochimaru and the Third Hokage.

Later when the Four Sounds were going to deliver Uchiha Sasuke to Orochimaru, the five Leaf Genin led by Shikamaru followed in pursuit. Kidoumaru stayed behind to battle Hyuuga Neji as Tayuya and Sakon continued on. It was then revealed that like Sasuke, Kidoumaru had been given a cursed seal by Orochimaru. Due to Neji's superior defense Kidoumaru had to utilize his cursed seal level 2 form. In this form a third eye opens on his forehead. With the third eye he attains great accuracy when using his kumo-nenkin bow and arrow. In the end even this was not enough. Barely alive Neji was able strike one final blow to apparently kill Kidoumaru.

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After Uchiha Madara swayed Sasuke to his side, he sent the young man after this Bijuu. They eventually found Killer Bee training in the mountains. The man is marked by a tattoo of "iron" on his shoulder and bull horns on his cheek. He wears sunglasses and wields seven swords, with his cloaked tailed state as his eighth "sword". Bee squared off against Team Hawk and maintained the upper hand, critically injuring Sasuke. Bee chose to pull out Hachibi to fully test himself. Sasuke was healed by his comrades and chose to unleash Amaterasu on his opponent. Hachibi thrashed about, knocking some of the black flames onto Karin. Sasuke cut off one of Hachibi's tentacles and managed to extinguish the flames on both Karin and the Bijuu. As they dispersed, Killer Bee fell back to the earth unconscious.

Sasuke tied him up and turned him back over to Akatsuki. As Akatsuki began to extract the Bijuu, they looked in surprise as the Jinchuuriki turned into a tentacle. Back in the Lightning Country, the tentacle Sasuke severed was still at the bottom of the lake. From it emerged Killer Bee. Hachibi chastized the plan Bee had carried out, as it forced him to lose several tentacles. Bee said it would be okay, as they would grow back. He then considered that maybe he should switch to being a folk singer and take the opportunity to finally leave his village, since they thought he had been captured.

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Kin and her team were ordered to find and kill Uchiha Sasuke. Unfortunately Orochimaru merely used the team as fodder to test Sasuke's powers after he placed a cursed seal on him. Kin and her team made it to the third round preliminaries, but she lost to Shikamaru. Later, when Orochimaru used his forbidden jutsu Edo Tensei, he needed a sacrificial body to hold the soul of one of the dead Hokage. Unfortunately for Kin, Orochimaru used her one last time and sacrificed her to help complete the jutsu.

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When Kumo once attempted to capture the Kyuubi, the brothers were ingested by the beast. They raged in its stomach for two weeks before they were finally vomited out. Through this process they managed to absorb some measure of the beast's chakra, and as a result took on some of its physical characteristics in the form of whiskers. They also grew dissatisfied with the leadership of Kumo when Nidaime Raikage attempted an alliance with Konoha. The brothers launched a coup d'etat and were branded criminals by the village.

After Kabuto joined forces with Akatsuki, he resurrected many dead ninja to fight at their side using Edo Tensei. This included the Kingin Kyoudai and the four Hougu they wielded. The Kingin Kyoudai met Darui's First Division in battle, utilizing the Hougu to seal away both Samui and Atsui with the tool's unique abilities. The brothers then managed to curse Darui himself, with the goal of adding him to their list of victims.

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When Akatsuki and Yakushi Kabuto joined forces to initiate Uchiha Madara's Eye of the Moon plan, the Five Great Shinobi Villages and the Iron Country Samurai alligned to fight them in the Fourth Great Shinobi War. Kitsuchi was selected to lead the Second Division in the conflict. Kitsuchi and his daughter took charge when the army of White Zetsu marched underground near their position, using their jutsu to emit the enemy army onto the ground above for direct combat.

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Konan possesses the ability to disperse her body into paper, which can then fold into whatever shape she desires, such as butterflies for tracking. Konan was orphaned at a young age in the war torn Rain Country and met two other orphans named Yahiko and Nagato. The three kids met the Sannin on their way back from the war. Jiraiya took a liking to the children and promised to help them train and become stronger. Jiraiya taught them jutsu until the day they became strong enough to fend for themselves. He eventually took his leave and Konan and the other orphans remained behind to do what they could to change the way their country and the world operated. At some point Yahiko died and Nagato became the man known as Pain. Konan was also changed by the conflict and joined Akatsuki.

She would join Pain when he went to the Fire Country searching for Naruto. When they arrived at Konoha, Pain used some of his bodies as diversions, while Konan and the other half of Pain's bodies would search for Naruto. Konan eventually retreated to protect Nagato when he destroyed Konoha using his Tendou body. She then watched as Nagato engaged in a dialogue with Naruto, eventually being swayed by the young man's drive and vision for the future. After Nagato gave his life to resurrect everyone in Konoha, she took his body and Yahiko's, which was acting as Tendou away for burial. She then offered Naruto flowers as a hope he would bring a change to the ninja world. She would later bet her life on Naruto when Uchiha Madara sought Nagato's Rinnegan. She fought the man in battle, eventually losing her life in the process.

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After Kabuto joined forces with Akatsuki, he resurrected many dead ninja to fight at their side using Edo Tensei. This included the previous generation of the Mist Seven Swordsmen and Kushimaru. When the Edo Tensei ninja Gari and Pakura met the Third Division of the Joint Shinobi Army in battle, they summoned the other six members of the group to fight along Momochi Zabuza. Kushimaru was among the ninja who still had access to his original weapon. When Zabuza used his Kirigakure jutsu to shroud the battlefield in mist, Kushimaru and the other ninja used their sword's abilities against their living foes.

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Even though it is one of the Bijuu, Kyuubi can be controlled by several individuals, including Shodai Hokage and the Mangekyou Sharingan of the Uchiha. It was the powerful Mangekyou ability which some said allowed Uchiha Madara to tame the Kyuubi. His control of the beast is what allowed him to direct it to attack Konoha around the time of Naruto's birth. Kyuubi would recognize Madara's cursed bloodline again in the future when Uchiha Sasuke used his Sharingan to peer inside the prison holding him inside Naruto.

The power of the Kyuubi has affected Naruto in several ways physically. When Naruto's body becomes injured, the power of the Kyuubi will leak out and heal Naruto's body at a very quick pace. Also, when Naruto experiences emotional experiences the chakra and power of the Kyuubi begins to leak out and turn Naruto into a more feral individual. At first he had little control over the ability to draw on the Kyuubi's chakra, but the Sannin Jiraiya taught Naruto how to reach deep inside himself and convince the Kyuubi to give him extra chakra when needed. This large amount of additional chakra allows Naruto to perform Kage Bunshin on a very large scale and also summon the Toad Boss Gamabunta. Kyuubi remains a reluctant prisoner within Naruto, stubbornly saving Naruto with his chakra only out of necessity to protect his own life.

The Akatsuki criminal organization has expressed interest in obtaining the Kyuubi from Naruto for their own diabolical ends, though they have yet to accomplish this goal. Demon imbued persons are called "jinchuuriki" by Akatsuki, literally "the power of human sacrifice". This seems to stem from a life being lost when the demon is imbued into the individual. For Naruto, Yondaime Hokage gave his life to imprison Kyuubi.