Another plot could be a 'what - if' scenario. What if Kushina didn't die? Naruto grows up with his mother around. The story could explore how Kushina helps Naruto train, not just in ninjutsu but also in understanding his Uzumaki heritage. It could also show how their relationship affects Naruto's relationships with others in the village, like how he might be more confident with Kushina's support.
One idea could be a time - travel plot where Naruto, Naruko (presumably a female version of Naruto), and Kushina are all brought together in a different era. They could team up to face a new and powerful enemy that threatens the very existence of their clan or the village. Another could be a story where they are all in a training session together, with Kushina teaching the two younger ones some of her unique ninja techniques.
One interesting plot could be that 'dark kushina' initially tries to manipulate Naruto for her own goals but gradually develops real feelings for him as she gets to know him better. Another could be that they are forced to work together to save the Hidden Leaf Village from a powerful enemy.
Perhaps in this fanfiction, Naruto discovers a hidden ability that was passed down from Kushina. They go on a journey together to learn more about this power and how to control it. This would involve a lot of training sessions and some heart - to - heart conversations between mother and son.
Maybe in the fanfiction, Naruto discovers a hidden part of his chakra that has a special link to young Kushina. This link allows them to communicate telepathically. They then use this connection to share secrets about their respective lives, and Naruto learns more about his mother's past and her dreams when she was young.
Well, a story could be centered around Naruto having prophetic dreams about Kushina. These dreams lead him to explore more about his mother's past and in doing so, he uncovers secrets that strengthen his connection with her. They could also be in a situation where they have to enter each other's minds to fight off an evil entity that's attacking their mental states.
A possible plot could be that there is a prophecy about Demon Naruto and Kushina. They have to work together to fulfill this prophecy which involves saving the ninja world from a great disaster. Along the way, they face many challenges. Kushina helps Naruto come to terms with his demon side, and Naruto uses his power to protect Kushina from the various threats they encounter. Their relationship evolves as they struggle to complete their task.
One idea could be a story where Kushina, with her connection to the Nine - Tails, helps the fem Kyuubi (in a more human - like form perhaps) and Naruto to understand each other better. Maybe they all have to work together to defeat a new threat that targets the unique bond between Naruto and the Kyuubi. Another plot could involve the fem Kyuubi having some sort of past connection with Kushina that gets revealed as they interact with Naruto, leading to a deeper understanding of their intertwined fates.
One idea could be that they travel back to a crucial moment in the history of the ninja world and change some small events that end up having a huge impact on the future. For example, they prevent a certain battle from happening too early, which gives the ninja villages more time to prepare for a bigger threat that was coming later.
How about a story where Naruto, Kushina and Naruko are all transported to a different dimension? In this new world, they have to rely on each other to survive and find a way back home. Along the way, they face various challenges that test their relationships and their individual strengths.
A third plot idea is a crossover where Kushina enters a world that combines Naruto elements with elements from a post - apocalyptic setting. She has to use her ninja skills to survive in this harsh new world. Maybe there are new types of chakra - based threats or she has to find a way to restore order using her leadership skills. This would put her in a completely different situation compared to what she's used to in the normal Naruto world and force her to adapt and grow in new ways.