Itachi was only 4 years old during the Third Great Ninja War. He saw his family members die and was traumatized. It was from this that he developed pacifist ideals and a desire to protect Konoha from war.
He was an extremely gifted ninja (from a young age he quickly mastered the Sharingan) who became the pride of his father, Fugaku. The people of Konoha recognized his formidable (and early) advancement in the ninja hierarchy of the village. He became a genin at the age of seven, mastered the Sharingan at the age of eight, became a chûnin at the age of ten and became a captain in the Anbu special sections at the age of 13.
This was a time when he was close to his younger brother Sasuke, who was relatively introverted because of his older brother’s exceptional talent. But when he discovered some truths about his clan in relation with his talent and more precisely the Mangekyô Sharingan, his relationship with his family deteriorated little by little.
Indeed, the Uchiwa clan had enough of being left out of the political affairs of the village after Kyûbi’s attack seven years before. So they decided to make a coup d’état in order to put Fugaku, their leader, in power. Itachi, being part of the Anbu, was sent as a spy, but his pacifist ideals were exploited by Danzô Shimura who made him a spy of Konoha with the Uchiwa. This was known only to Danzo, Koharu Utatane, Homura Mitokado and the Third Hokage. The latter tried to solve the problem with diplomacy but without success. Get a glimpse at
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Following his meeting with Madara Uchiwa who revealed to him the history and the birth of the clan, he discovered among other things that the Sharingan could “mutate” into an improved version of the Sharingan, offering new techniques specific to this type of dôjutsu: the Mangekyô Sharingan, on the sole condition of killing his best friend. Some members of the clan suspected him of being responsible for the death of Shisui, his best friend, who would have committed suicide. The truth was that Shisui possessed the Mangekyo Sharingan like Itachi and that he was coveted by many people including Danzo who stole his right eye. Shisui then gave his left eye to Itachi before dying and making his body disappear.
After a meeting with the Third Hokage, Homura Mitokado, Koharu Utatane and Danzo where they discussed how to deal with the Uchiwa Clan, Itachi was summoned by Danzo who explained to him the reaction of Konoha if the coup took place. He proposed the mission of eliminating his entire clan before the coup to save his innocent brother and Itachi accepted. Soon after, he found Tobi pretending to be Madara Uchiwa and made a deal with him to slaughter the Uchiwa clan.
Finally, he was given the mission to massacre his clan and he killed all the members of his clan, including his parents, one by one, except Sasuke. Itachi then told his little brother that if he wanted to take revenge, he had to have the Mangekyo Sharingan and said “If you want to defeat me, hate me, hate me, and survive by all means”. He disappeared from Konoha at the end of that terrible evening after shedding some tears.
He then mentioned the existence of a third Uchiwa still alive, revealing to Sasuke that if Sasuke obtained the Mangekyô Sharingan, he would be the third Uchiwa able to activate and use it after Madara Uchiwa and Fugaku Uchiwa, his father.
Itachi asked the Third Hokage to protect Sasuke.
He went to the Third Hokage and asked for his protection for Sasuke and left Konoha for the rest of his life.
He then joined the Akatsuki (a criminal terrorist organization made up of nine S-ranked ninjas) in order to watch Tobi (claiming to be Madara Uchiwa) who was the unofficial leader of the organization. His ring features the kanji “Purple” (朱, Shu) on a red background, which he wore on his right ring finger. On behalf of this organization, he searched for Naruto Uzumaki to extract Kyûbi, the nine-tailed fox demon sealed in his body (he also searched for the other eight demons).
Itachi shows himself superior to Orochimaru.
In the Akatsuki, he initially teamed up with Orochimaru until the latter left the organization after failing to take Itachi’s eyes, then he teamed up with Kisame Hoshigaki, who was his comrade-in-arms until the agony of the Akatsuki’s reign. Itachi was at the origin of Deidara’s association with the Akatsuki, and provoked the departure of Orochimaru, having defeated him thanks to his Sharingan while he was trying to steal his body. We could see throughout the chapters that his devotion to the Akatsuki was unfailing. Itachi was still a character whose motivations were revealed in bits and pieces.
During this period, he grafted Shisui’s left eye on a crow and gave the command “Protect Konoha” to the Kotoamatsukami technique so that if Sasuke decided to graft his eyes, the crow, attracted by Itachi’s Mangekyô Sharingan, would use it on him in order to force him to defend Konoha.
From a young age, Itachi was quiet and perceptive, showing a notable maturity for his age and knowledge of how to deal with any situation. At the same time, Itachi was still quite naive as a child in many real-world scenarios, and as such was willing to learn from his peers on how to differentiate certain situations. He lived from a distance, observing individuals and ideas without direct involvement in order to be able to fully understand them. Although this approach prevented him from getting close to many people, it allowed him to think and act without making prejudices, while evaluating things in the most fair way possible. In the anime, Itachi unwittingly gained many friends and admirers for his concern for others despite his passive nature. 7] He thought more about the shinobi of the village and the village itself. 8] For this reason, he never became arrogant about his own abilities or accomplishments. He received many praises for his ability to react in certain situations, but also for the maturity he had. Regarding his loyalty to his clan which was a common reaction among the Uchiwa, although he loved his family and wanted the best for them, he knew that there were more important things than the personal aspirations of the clan. Itachi’s dream was to become a Hokage, but he kept this secret.
Despite being an accomplished pacifist, Itachi felt that his own needs were secondary to the good of the village and his clan, so he became a shinobi. He trained relentlessly to improve himself as quickly as possible and submitted himself to all the inconveniences of shinobi life without complaint for the simple motivation of being useful to others. His commitment bordered on recklessness, due to his private training using extremely deadly methods such as dodging a barrage of kunai in the anime. Being so gifted compared to the average ninja, this allowed Itachi to deal with less violent issues than others, emphasizing his peaceful nature. These two extremes of his personality came into conflict when events turned to the fall of the Uchiwa clan. He did not want to harm his family and sought a peaceful resolution, but knew that the path of least bloodshed would be the extermination of the clan. When the Uchiwa clan refused the proposal of the Konoha leaders, Itachi was pushed to the limit and his usually polite attitude towards his clan members became more violent, openly criticizing them and beating them for the choices that sealed their fates and his own.