Perhaps in the fanfiction, there's a prophecy related to baby Naruto that only Itachi is aware of. Itachi then takes it upon himself to secretly guide Naruto's growth from a distance. He leaves little clues and signs for Naruto to discover as he grows up, which would be like a long - term mentoring that shapes Naruto into an even more powerful and understanding ninja.
One idea could be that baby Naruto somehow crosses paths with Itachi in a secret mission. Maybe Itachi is on a mission in Konoha and stumbles upon baby Naruto who has an unusual chakra flare. Itachi, being curious, decides to keep an eye on him without revealing himself. This could lead to a series of events where Itachi's actions unknowingly protect Naruto from some early threats.
One idea could be a story where baby Itachi meets a young Naruto in a sort of alternate universe. Maybe Naruto stumbles upon a hidden place where baby Itachi is being kept safe. They form an unlikely friendship, and Naruto's positive energy starts to influence Itachi in a way that makes him question some of the darker paths he might take in the future.
One idea could be Itachi discovers Baby Naruto has a unique chakra signature that could change the future of the ninja world. So, he decides to secretly protect Naruto from afar. Another could be Itachi is tasked with a mission that involves Baby Naruto in some way, like having to test Naruto's potential without the village knowing. And a third could be Itachi has a vision of a future where Baby Naruto is the key to peace, and he starts to subtly influence Naruto's growth even at that young age.
One plot idea could be Sasuke discovers a way to travel back in time and meets baby Itachi. He then tries to protect Itachi from the future tragedies that he knows will occur. Another could be in a parallel universe where Sasuke is tasked with taking care of baby Itachi and he has to learn how to be a caretaker while also dealing with his own emotional turmoil. Maybe there could also be a plot where an enemy targets baby Itachi and Sasuke has to use all his skills to keep him safe.
One idea could be that Itachi survives his battle with Sasuke and teams up with Naruto to face a new, powerful enemy from the Otsutsuki clan. They combine their unique skills, Naruto's Rasengan and Itachi's Sharingan abilities, to take on this threat.
A possible plot could involve Female Itachi being an outcast in her own clan because she has different ideals. Naruto, who always believes in people, befriends her. They then start a journey to prove that her ideas can bring peace to the ninja world, facing opposition from both their own and other clans.
One idea could be exploring Itachi's time in ANBU and how Naruto might have influenced his decisions secretly. Maybe Naruto, with his unique way of seeing people, could have made Itachi question his path in the ANBU more deeply.
One idea could be that the Kyuubi's power somehow interacts with Itachi's Sharingan in a unique way. Maybe Itachi is able to use the Kyuubi's chakra to enhance his genjutsu even further. Another plot could involve Naruto, with the Kyuubi inside him, teaming up with Itachi to face a common enemy that neither could defeat alone. For example, a new powerful Otsutsuki clan member arrives, and their combined skills are needed to save the village.
Maybe a fanfiction where Konan discovers a secret about Itachi that could change the way Naruto views him. This could lead to a complex web of relationships and a journey of self - discovery for Naruto as he tries to figure out who to trust. The story could also explore Konan's past more deeply in relation to this new discovery.
One idea could be that they are on a mission together in a mysterious land. They start off as distrustful partners but as they face various challenges, like powerful enemies and difficult terrains, they gradually develop a deep understanding and respect for each other. This could lead to them sharing their past traumas and forming a strong bond.
A great plot could be Itachi teaching Naruto how to control the Nine - Tails' chakra in a completely different way than Jiraiya did. Since Itachi has such a deep understanding of chakra and its nature, he could offer unique insights. Also, there could be a story where Itachi and Naruto are forced to team up against a common enemy that is using an ancient and powerful jutsu. In the process, Itachi passes on some of his Uchiha clan's wisdom to Naruto. And perhaps, Itachi could help Naruto deal with the loneliness that often comes with being a jinchuriki, as Itachi has also felt isolated in his own way.