Kabuto is a former right hand man of Orochimaru before his death.He is a Spy for many countries including the Akatsuki and after Orochimaru's death. Kabuto injects himself with his remains giving him a snake like appearance and all his abilities. He later allied himself with Tobi for his goals.
Kabuto's earliest childhood memory is being found by Nonō on the outskirts of a destroyed village. Suffering from a head wound and amnesia, he had no recollection of his parents or his own identity. The nun treated his wounds with medical ninjutsu and brought him to an orphanage. Shy and reserved, Kabuto did not speak to anyone or thank the nun for her kindness, which led a fellow orphan, Urushi, to question whether or not he had any manners, before slamming a helmet on Kabuto's head to protect his healing wound. When Urushi declared that his lack of a name was annoying, the nun decided to name him "Kabuto", after the helmet. Later that night, Kabuto felt guilty about not thanking the nun and got out of bed to find her, only to get in trouble with the other wards for being up past his curfew. When they took him to a clock to teach him the curfew time, it at first seemed that he was too young to tell time, but the nun recognised that he was squinting and lent him her glasses, allowing him to impress the other caretakers by correctly determining the time of the curfew despite his young age.
Because the orphanage could not afford glasses for him, the woman let him keep hers, and Kabuto broke down in tears, repeatedly thanking her as she comforted him. Over the years, Kabuto would be taught various medical skills by Nonō, such that he was eventually able to assist her in healing shinobi and thus, earn money for the orphanage. It was here that he first met Orochimaru who asked him if he wanted to become a shinobi, stating that the role would suit him, but Kabuto declined. However, after eavesdropping on a conversation Nonō had with Danzō Shimura and hearing the latter's demand for an orphan in exchange for funding, Kabuto instead accepted the offer. From this point onwards, he was tasked with infiltrating various hidden villages, including those of the Five Great Shinobi Countries. During one such assignment in Iwagakure, he was forced to flee after his cover was blown and unwittingly attacked his "mother", Nonō, in the process. With her unable to recognise him even as he healed her injuries, Kabuto came to question his identity and purpose, when he was once again approached by Orochimaru.
Orochimaru explained to him that his unfortunate encounter with Nonō was engineered by Danzō himself: having become an accomplished spy, Kabuto has become an asset too dangerous to handle for Root (and thus to be eliminated). Orochimaru also pointed out that as a spy for Konoha, (and after travelling to many countries), Kabuto already is losing track of his own true self due to not knowing where he came from and the constant changing of his identity to fulfil his role. Nonō, in turn, was double-crossed by Danzō into believing that they released Kabuto from holding and was living a civilian life, in exchange for assassinating another person (who is no other than the real Kabuto himself). Distraught by this information, Kabuto attacked Orochimaru but was stayed by the latter's offer of a new identity, as well as becoming his right-hand man in the the village he was about to found. In returning to Konohagakure, Orochimaru gives him a new cover: that he was found amongst the dead enemies after the Battle of Kikyō Pass by a captain of the Konoha Medic Corps, and that captain brought him to Konoha and raised him as a son. He was later sent to serve as Orochimaru's spy to Sasori of Akatsuki, who in turn set him to spy on Orochimaru by using Memory-Concealing Manipulative Sand Technique to transform him into his own sleeper agent. Orochimaru discovered this and released Sasori's control over Kabuto. Kabuto has since used his expertise in spying for Orochimaru, playing the role of Sasori's servant to gain knowledge of Akatsuki's plans. Through his affiliation with Konoha, Kabuto was also able to acquire the rank of genin and enter the biannual Chūnin Exams, using the first two parts of the exam to gather information on his fellow participants for Orochimaru's use. Additionally, with the medical expertise taught to him by his adoptive parent and his high intelligence, Kabuto is able to carry out human experiments alongside Orochimaru, while at the same time increasing his own knowledge of the human body.
Kabuto's life is steeped in mystery. The first mention of him, he was found wounded at the batttle of Kikyo pass. He was taken in by a Konoha Medical-nin, who taught him everything he knew. Kakashi's first statement when he sees Kabuto in the hospital with an unconscious Sasuke at scalpel point was "Oh, you're that medic's son" , making Kakashi seem more knowledgeable about Kabuto than he had previously shown.
At some point, he was put under the mind control of Sasori of Akatsuki to spy on Orochimaru. Orochimaru discovered this and freed Kabuto from Sasori, seeing that Kabuto may have had some useful jutsu for him to take advantage of.
Sasori however, would never find out that his jutsu had been broken by Orochimaru, as he would be killed by Sakura and Chiyo and then tell them where to go to meet a spy that he was supposed to meet up with, only to be impersonated by Yamato, who had no idea what Kabuto knew about Sasori.
Somewhere along the line, Kabuto joined Orochimaru in Otogakure (the Village hidden in Sound) and became somewhat of Orochimaru's right hand man, and was always Orochimaru's first choice when sending someone on a spy mission, as Kabuto was one of the few people in the Naruto universe who's true thoughts were never revealed anywhere, not in battle, not in speech. It is implied that even Orochimaru doesn't know Kabuto's true allegiances, as when he tells Kabuto to go capture Sasuke, who was in the hospital, that now would be the only chance he would have to stop him, as though he were pondering what Kabuto would do next. Yakushi was next seen as a member of Konoha, attempting to beat the Chunnin Exams along with the "rookie nine", consisting of Naruto, Sasuke, Sakura, Ino, Choji, Shikamaru, and Shino, Kiba, and Hinata. This was supposedly his 7th time in attempting to pass the exams.
His first mention and appearance in the series, he is seemingly quite a nerdy kid. Upon hearing Naruto Uzumaki proclaim to the rest of the aspiring chuunin in the room that he would one day beat every one of them, he was forced to react to stop him from getting hurt, possibly as another way to force them into thinking he was their friend. Talking to them like a cocky superior, he asked them if they needed any help with the specifics as this had been his seventh time apparently in taking the exams. They were astonsihed to think that he was actually taking this exam again after all of it had gone by, but he told them that it was harder than they thought. He asked anyone if they wanted information on any of the new ninja, and of course Sasuke was the very first to ask him about Rock Lee and Sabaku no Gaara, but he wondered how Kabuto would possibly know about them.
He pulled out a deck of cards that he infused with his own chakra, and told them that with these he was able to carefully analyze his enemies and collect information on them. He also commented that Sasuke knowing their names made this a much easier process, and first went ahead and told him abotu the one from the village that they were familiar with, Rock Lee. Lee was a specialist in taijutsu, but nothing else and had gone on multiple C-Rank missions with his team of Guy, Ten Ten, and Neji Hyuuga.
Gaara, however, the mysterious ninja from sand was a different story, he had done multiple D-Rank missions, several C rank, and even one B-Rank mission with his team of Temari, Kankuro, and his sensei. Kabuto commented that there are very few genin that ever go on B missions, as often they're just simply far too tough for them. The thing that scared Kabuto the most though, and the others around him, was the condition that he had come out of all of these missions : unscathed. With this, Sasuke and Naruto felt slightly chilled, until kabuto quickly changed the subject, talking about how there was also a new village in the midst of their ranks, Otogakure, aka the Village Hidden in Sound. Kabuto stated that the three genin from there (Dosu, Kin, and Zaku) were simply just representatives of the no name backwater country of Sound.
Upon hearing this, the three became violent, and attacked Kabuto where he stood. He dodged the kunai thrown from one, and wehn one blow was thrown towards his face he was able to carefully but swiftly move out of the way, his glasses broken. Looking at them, he wondered what had happened, in a slightly amused fashion, until he felt sick and began to vomit. The sound ninja bandaged up told him the secret to this, the amplifier on his arm, the sound from it had been directed by Dosu's chakra into Kabuto's ears, and thus disrupting the flow of some of the water and causing him to lose his balance and just go nausious. Kabuto picked up his glasses, and simply walked away after being told by the three patriotic genin that they would be the "next big thing" and that he would be killed if he got in their way again.
Little did the genin know, Kabuto was more in on their plan than they werem as compared to their relationships with Orochimaru, Kabuto was second to none. It was unrevealed what or how Kabuto did in the first part of the Chuunin exams, the written section, other than that he passed it, as he was able to assist Naruto and his friends in the Forest of Death, the second part of the exams. He had apparently strayed away from his team, which had already gotten their scrolls it would seem. Since he had no idea where they had been split up, apparently, he decided that he would help out Naruto and co. while they ran through the death filled woods on their way to the tower in the center of the forest with their scrolls. Along the way, Kabuto and Sakura noticed that they were going around in circles, as there had been the same branch pattern and rocks for the past few miles...it took the others a while to understand what this meant, but Kabuto knew what they were doing immediately : another genin was attemping to confuse them with genjutsu, to wear them out without fighting for their scrolls. A sly movement, if it weren't for them discovering what was going on due to Kabuto's smarts and the genin's miscalculations...they had thrown their kunai too early to try and take them down, and it was quickly stopped.
Naruto went out and called out their opponent, only to be warned by Kabuto that this was not a good idea, as there appeared to be a lot of them. In reality this was just another trick from the genjutsu using genin, and the multiple kunai were simply being thrown from one point in synchronization with his clones to make it seem as though there were many of them, from one point. Kabuto was about to tell them a plan to devise in order to make their strategy fall apart, when suddenly from out of the blue a kunai was thrown into his face, he was quick enough to dodge it, but it still scraped his face, and broke his glasses. It was in this moment that Kabuto's character went in depth, as his eye color changed to red, and he looked enraged with a passion. He has only mentioned this red eye technique once since this instance, only a few chapters later, saying that it was too dangerous for him to be a part of the third round of the chuunin exams with his red eyes. We still don't know if there was some truth in this statement, but for the most part Kabuto only left the exam to fulfill the orders of his true master...Orochimaru.
He met up with Orochimaru in an uninhabited area of the Leaf village at the moment, and discussed their plan. Sasuke was ill stricken in the hospital because of the curse mark set upon him by Orochimaru, and that now was the time to take him with them. Kabuto's mission was to kidnap the young boy and then bring him back for good. He also noted that if Kabuto was ever going to try and stop him, that the only way he could would be to kill Sasuke now, meaning that Orochimaru didn't even know what side the young boy was truly on. Kabuto froze for a moment at these words and looked at him with a very strange look in his eyes, only to tell him that he would never betray him. Upon arriving at the hospital he murdered all of the Anbu Stationed out side of Sasuke's hospital room, who was still quite fast asleep from the effects of the attempted curse mark seal from the elite jonin Kakashi, also his master. Finally, after all of the Anbu
were actually dead, he came up to Sasuke, with a scalpel at his unconscious throat, ready to clip the tube that was over his mouth. Right when he was about to take him (or so we assume, he may have been trying to kill him and stop Orochimaru, or just do something else altogether, we still don't know his true motives) , he was suddenly stopped by Kakashi. Kabuto commented that maybe next time they may want to leave about ten anbu as opposed to six, as it was far to simple to kill them. Kakashi began fighting Kabuto in hand to hand combat, but it turned out that what Kakashi was fighting was an animated Anbu corpse made to look like Kabuto, using one of Kabuto's signature techniques it would seem, the Art of Dead Souls. In actuality the real Kabuto had been postering as one of the many dead Anbu on the ground, and when given the chance and Kakashi realized that he was just a shadow clone, Kabuto leapt out of the window, revealing the face under the anbu mas to be his. Kabuto accompanied Orochimaru to ask for Tsunade's help, at which they gave her a few days to decide. When the meeting between Tsunade and Orochimaru took place,
Kabuto was sent to kill anyone who'd interfere, but got scared and left when he saw Jiraiya. He then stopped Tsunade and Orochimaru, being a medical ninja he saw that Tsunade's technique was fatal, not healing. He decided to retreat to a more opened location to fight her, and she followed.
The two fought and Tsunade started to gain the upper hand, to which point Kabuto used his trump card... knowing her phobia of blood, he cut himself. Before he could kill her however, Jiraiya, Naruto, and Shizune appeared. He fought with Shizune and Naruto and was winning, but Naruto hit him with the Rasengan which put him down.
During a ruined assassination attempt by Orochimaru and Kabuto to kill Sasori, Kabuto was faced by Yamato and Sakura while Orochimaru fought the 4-tailed Naruto. Knowing that Orochimaru didn't want them dead because of their usefulness, Kabuto decided to heal Sakura who was struck violently by the out of control Naruto.
After Sasuke defeated Orochimaru, Kabuto would later meet with Naruto and co. to give them all of the information gathered on Akatsuki and it's members, he then revealed that he used his medical skills to graft portions of Orochimaru's body onto himself. When explaining why, he compared himself to Naruto and Orochimaru to the Kyuubi within Naruto. Kabuto said that he was always dependent on Orochimaru's power but he's going to make Orochimaru's power his own... he later claimed that Orochimaru's trying to take over and he's trying to resist. Before he left, he stated that he will seek revenge on Sasuke.
Kabuto is later seen in the Waterfall village attacking Waterfall ninjas, he has also left behind corpses for the Leaf village to find which baffles Anko. He then finds Madara's hideout and confronts Madara. Since Kabuto worked as a double agent against Akatsuki, Madara accuses him of being a traitor and attacks but Kabuto keeps his distance, using Resurrection to the Impure World to summon: Deidara, Itachi, Kakuzu, Nagato, and Sasori. Rather than attack, Kabuto insisted that he wants to join Madara.
Kabuto and Tobi prepared for war against the allied forces.
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