Itachi's life was full of tragedy and self - sacrifice. He was a prodigy in the Uchiha clan. He was forced to make a hard choice between his clan's rebellion and the safety of the village. In order to prevent a civil war and protect the Hidden Leaf Village, he chose to slaughter his own clan, sparing only his younger brother Sasuke. He then joined the Akatsuki, all the while secretly protecting Sasuke from the shadows and guiding his growth, until his death where his true intentions were finally revealed to Sasuke.
Itachi's life story is one of self - sacrifice. From a young age, he showed extraordinary talent. However, the political situation in the village put him in a difficult position. The Uchiha clan's plan for a coup made the village leaders order Itachi to take action. So he had to choose between his clan and the village. In the end, he chose the village and carried out the massacre. He then joined Akatsuki to keep an eye on the organization's activities, all while protecting Sasuke from afar.
The Uchiha clan massacre is by far the most crucial event. Itachi's actions that night shaped his entire future and how he was perceived. Then, his interactions with Orochimaru within the Akatsuki were important. Orochimaru had his own plans regarding Sasuke, and Itachi had to be vigilant. Also, every time he met Sasuke secretly during Sasuke's growth journey was significant. These encounters were filled with unspoken messages and were important for Sasuke's development and for Itachi to keep tabs on his brother's progress.
Well, first of all, Itachi's early life as a prodigy in the Uchiha clan set the stage for his future. But the most impactful was the clan massacre. Itachi had to make a choice that no one should have to make. After that, his time in Akatsuki was important as he was constantly walking on a tightrope between his loyalty to the village and his role in the organization. And his encounter with Sasuke near the end, where he passed on his powers and the truth, was a major event in his life story.
Yes, there are likely such fanfictions. Many fanfiction writers like to explore the idea of Itachi coming back to life with his memories intact. This allows for interesting character interactions, especially with Naruto. Itachi could use his wisdom and skills once again, and his relationship with Naruto could further develop in new and unexpected ways.
Naruto would adapt to Itachi's life in several ways. Socially, he'd have to get used to Itachi's connections and rivalries. For instance, his relationship with Kisame would be different as Naruto. He might try to influence Kisame in a more positive way. Emotionally, he'd have to deal with Itachi's internal struggles. Itachi had a lot of guilt and secrets, and Naruto would have to either come to terms with them or find a way to resolve them. And in terms of combat, he'd practice Itachi's signature moves over and over to make sure he could use them effectively in battle.
The most important event was him killing his clan. This changed everything for him and Sasuke. Another one was joining the Akatsuki. It put him in a new and dangerous situation.
Itachi Uchiha's story is complex. He was a prodigy in the Uchiha clan. He was forced to make a difficult choice to protect the village. He slaughtered his entire clan, sparing only his younger brother Sasuke. He then joined the Akatsuki as a double agent, all while secretly hoping Sasuke would one day be strong enough to kill him and avenge the clan.
Itachi Uchiha was a complex character. He was a prodigy in the Uchiha clan. He joined the Anbu at a young age. To protect the village from a potential Uchiha coup, he slaughtered his entire clan, sparing only his younger brother Sasuke. He then became a rogue ninja and joined the Akatsuki. All his actions were driven by his love for the village and his brother in a very twisted way.
In Itachi yaoi fanfiction, Itachi is often depicted as a complex and mysterious character. He is usually highly intelligent and powerful, which makes him an alluring figure in romantic or relationship - based stories. His loyalty, whether it be to his family, his village, or his love interest in the yaoi context, is also a common characteristic explored.