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.
One possible plot could be that Naruto discovers a powerful and long - forgotten jutsu that has the ability to revive the dead. He decides to use it on Itachi. Once Itachi is back, they join forces to stop a new, powerful enemy that is threatening the ninja world. Itachi's skills and knowledge, combined with Naruto's power, make them an unbeatable team.
One possible plot could be that Naruto, consumed by his love for Itachi (in a yaoi sense), embarks on a journey to find a way to bring him back. He might encounter some ancient and forbidden jutsu that has the power to resurrect. Along the way, he has to face many challenges and enemies who oppose his plan. Once he brings Itachi back, they then have to deal with the consequences of defying the natural order of life and death in the Naruto world, and also explore their new relationship.
It's not really possible within the normal Naruto lore. But fanfiction is all about exploring 'what ifs'. In a yaoi fanfiction where Naruto brings Itachi back to life, it could be based on some extreme emotional bond. Maybe Naruto discovers a hidden power within himself that he can use to reverse death. But this goes against the established rules of the Naruto world where death is usually final. So, it's really a matter of the author's creativity and how they can justify such a huge event within the framework of the Naruto world, even if it's a yaoi - inspired take on it.
One of the main events was when Itachi was recruited by the village elders to stop the Uchiha clan's coup. This led to him having to murder his own family and friends in the clan. After that, his life in the Akatsuki was also a big part of his back story. He had to interact with various dangerous criminals in the organization while still having his own goals related to Sasuke and the village. And of course, his interactions with Sasuke over the years, especially the final battle where he revealed some of his true intentions to Sasuke, are crucial events in his back story.
Well, Itachi grew up in a time when the Uchiha clan was becoming more and more discontent with the Hidden Leaf Village. He was a very intelligent and skilled ninja even at a young age. When the situation with the clan reached a boiling point, the village leaders came to Itachi with a plan. He was torn between his loyalty to the clan and to the village. In the end, he chose to follow the village's orders. He killed most of the Uchiha clan members but spared Sasuke. He then joined the Akatsuki to keep an eye on them and also to push Sasuke to grow stronger through hatred for him.
Well, in the fanfiction, Itachi could go back in time and decide to train his younger self more rigorously. This would not only make him stronger but also change the way he approaches his future tasks. He might also try to influence Sasuke at an earlier age, guiding him in a different direction than in the original timeline. And he could befriend some characters earlier to build a stronger support network for the Uchiha clan.
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.
It could be Danzo. In the original story, Danzo was a major factor in the Uchiha massacre. If Itachi goes back in time, Danzo would likely still be plotting against the Uchiha. His thirst for power and his extreme methods would put him at odds with Itachi's new attempts to save the clan.