One possible plot could be that Shisui, with his skills and kind heart, trains Naruto in unique ways. He might teach Naruto advanced stealth techniques early on. Naruto could also inherit Shisui's sense of justice and loyalty, which would shape his character differently from the original series. Shisui could also introduce Naruto to different aspects of Uchiha culture, which would give Naruto an edge in understanding his friends like Sasuke better.
Well, it could be that Naruto, being neglected in the village, is noticed by Shisui. Shisui sees Naruto's potential and decides to train him in stealth and combat skills. Naruto then starts to grow stronger under Shisui's guidance, and eventually surprises everyone in the village with his newfound abilities.
If raised by Shisui, Naruto's personality would be significantly different. Shisui was known for his wisdom and strategic thinking. Naruto would probably be more tactful in his approach to problems. His sense of humor might be more understated. He would also have a stronger sense of loyalty towards Shisui and would be more likely to follow in his footsteps in terms of protecting the village in a more covert way. He might not be as loud and brash as in the original story, but rather a more calculated and perceptive ninja.
In a 'Naruto raised by Shinigami' fanfiction, the story could go in many directions. The Shinigami might train Naruto in secret, away from the prying eyes of the Hidden Leaf. Naruto could be taught how to use reaper - like powers, like being able to sever spiritual bonds. This would give him an edge in battles against enemies who rely on normal ninjutsu. Also, his relationship with the Nine - Tails might be affected as the Shinigami has its own connection to powerful entities.
One possible plot could be that Naruto grows up with Hanzo's strict and combat - focused training. He might learn unique jutsu and combat strategies from Hanzo early on. This could make Naruto a more battle - hardened ninja at a young age, with a different outlook on the ninja world compared to his canon self.
In this fanfiction, the story might start with Naruto being found or taken in by the Shinigami. The Shinigami could train Naruto in a different way than the regular ninja training. Naruto could learn secrets about the afterlife which could give him an edge in battles. He may also have a strange connection with the souls, which could be both a strength and a burden. For example, he might be able to communicate with the souls of fallen ninjas and gain their knowledge or power.
In this kind of fanfiction, Naruto might grow up with unique abilities and perspectives. Maybe he'd have an instant connection with the bijuu's power and be more in tune with nature. He could also face less discrimination as the bijuu might protect him from the start, leading to a very different Naruto compared to the original story.
One possibility is that Naruto would grow up with a different set of skills. Mei is skilled in water-based jutsu, so Naruto might be more proficient in water techniques rather than wind ones. He could also have a different view on politics and village relations as Mei is from Kirigakure, a village with a complex history.
Well, one possibility is that Naruto would grow up with a different view of the ninja world. Nagato's experiences with pain and his radical ideas might influence Naruto. He could be more cynical about the shinobi system at first. But Naruto's own kind heart might also start to change Nagato's views over time, leading to a very different Akatsuki perhaps.
Well, in such a fanfiction, Naruto might grow up with a very different set of skills. Manda is a large snake, so Naruto could learn more about stealth and survival in the wild. Maybe he'd be more in tune with nature. He could also develop unique fighting styles inspired by Manda's movements, like quick strikes and coiling maneuvers.
In a 'Naruto raised by Jashin' fanfic, Naruto would likely be an outcast in Konoha from the start. Since Jashin is a rather dark and feared cult - like figure in the Naruto universe. His appearance might be different too, maybe with some markings related to Jashin. His relationships with other characters would be strained. For example, he might not be friends with Sasuke as they have such different upbringings and beliefs. He could be seen as a threat by the village elders and constantly be under surveillance.