The plot could revolve around a mystery in the village that only Kushina, Mikoto and Naruto can solve. Maybe there are strange disappearances that are related to an ancient power that was once sealed by the Uzumaki clan and has some connection to the Uchiha. Kushina uses her knowledge of the Uzumaki history, Mikoto her understanding of the Uchiha lore, and Naruto his unique perspective as the Jinchuriki of the Nine - Tails. They have to overcome their differences and work together to save the village from this hidden threat. Along the way, they develop a deeper bond as they face various challenges.
In a fanfic, the plot could be that an enemy targets Naruto because of his connection to both the Uzumaki and the Uchiha through Kushina and Mikoto. Kushina and Mikoto, realizing the danger, decide to hide Naruto in a secret location. But Naruto, being the determined hero he is, doesn't want to hide. Instead, he convinces Kushina and Mikoto to train him so that he can fight back. The story could then show his intense training sessions with the two powerful women, his growth in power, and finally his showdown with the enemy who dared to threaten him and his loved ones.
The plot might revolve around a mystery that only they can solve. Maybe something related to an ancient artifact that has a connection to both the Uzumaki and Uchiha clans. As they search for answers, they have to overcome various obstacles and in the process, their friendship grows stronger.
A great plot could be that Naruto discovers a hidden scroll that was once in the possession of both Kushina and Mikoto. This scroll contains a prophecy about a great threat to the ninja world that only the combined powers of the Uzumaki and Uchiha clans can defeat. Naruto then has to convince Kushina and Mikoto to work with him to decipher the scroll and prepare for the upcoming danger.
A mother - son relationship between Naruto and Kushina can be deeply explored. Show how Kushina's spirit and love still influence Naruto even though she's not physically there. Also, a friendship - like relationship between Kushina and Mikoto can be shown. They could be two strong - willed women who support each other.
One idea could be a story about Kushina and Mikoto being friends when they were young and how their friendship influenced Naruto's life. For example, they could have made a pact to always look out for each other's children. Kushina might have told Mikoto some special Uzumaki techniques that Mikoto then passed on to Sasuke in a way. Another idea is a time - travel fanfic where Naruto goes back in time and meets his mother Kushina and Mikoto when they were in their prime. He could learn a lot about the past of the village and his family from them directly.
Perhaps a fanfic about a special training session. Kushina and Mikoto decide to train Naruto together. Kushina teaches him some unique Uzumaki jutsus, while Mikoto imparts some of the Uchiha's wisdom and combat skills. Through this training, Naruto not only becomes stronger but also forms a deep bond with the memories of his mother and Sasuke's family.
One possible plot could be that Mikoto somehow survived and she takes Naruto under her wing. She trains him secretly, using her Uchiha knowledge to make him stronger. This could lead to Naruto having a unique set of skills that no one else has.
A possible plot is that Mikoto stumbles upon baby Naruto in the forest. She takes him back to the Uchiha compound. There, she raises him as one of their own, much to the confusion of some Uchiha members. As Naruto grows, he starts to show unique abilities that are a combination of his Uzumaki heritage and the influence of the Uchiha environment.
Well, it could be about Mikoto seeing Naruto's lonely situation and deciding to take him in. Maybe she'd teach him some Uchiha techniques and help him grow stronger. She could also introduce him to Sasuke as a brother figure, changing the whole dynamic between Naruto and Sasuke in the Naruto world.
Well, perhaps in this fanfic, Naruto being raised by Mikoto means he has a more stable and loving upbringing. He could be friends with Sasuke from a very young age, and they might grow up like brothers. Naruto would also be exposed to the Uchiha's rich history and culture, which could shape his understanding of the ninja world and his own place in it. He might even get to know some secrets of the Uchiha clan that no one else outside the clan knows.
I'm not sure there should be such a fanfic as it involves some rather inappropriate and non - canon scenarios. Naruto has his own mother, Kushina, and Mikoto is Sasuke's mother in the Naruto universe. This kind of plot goes against the original setup of the story.