Perhaps a plot where Kushina is brought to the Fairy Tail world where Erza is from. Naruto, who has some connection to this strange event, follows. Erza takes Kushina under her wing, teaching her about the magic in this world. Naruto tries to adapt and in the process, he and Erza form a unique friendship. They then have to face a great threat in the Fairy Tail world together with Kushina's new - found magic skills.
One idea could be a story where Kushina comes back to life briefly and shares her old stories with Naruto and Tsunade. This could include tales of her time as a kunoichi and how she met Minato. Another plot could be a training arc where Tsunade trains Naruto in a special medical - ninjutsu technique that was once known to Kushina.
One idea could be a crossover where Naruto, Erza, and Mirajane are brought together by a powerful magic spell that goes wrong. They have to work together to reverse the spell's effects while also dealing with the differences in their worlds. Naruto's ninja skills, Erza's swordsmanship and armor changing abilities, and Mirajane's demon form and magic could create really interesting interactions and battle scenes.
A fanfiction could center around a family training session. Minato trains Naruto in advanced ninjutsu techniques while Kushina teaches him about the Uzumaki clan's secrets. This would not only strengthen their family bond but also make Naruto an even more powerful ninja.
One idea could be a time - travel fanfiction where Sakura somehow travels back in time and meets Kushina. Kushina could mistake Sakura for a future friend of Naruto's and start to train her in some of her unique Uzumaki techniques. Meanwhile, Naruto is left wondering how Sakura disappeared and tries to find a way to bring her back.
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.
One idea could be exploring Kushina's life before Naruto was born in more detail. Maybe show her training as a jinchuriki and how she met Minato. Another could be a story where Naruto discovers a hidden journal of Kushina's that reveals family secrets and advice for him.
Well, perhaps Demon Naruto has some sort of special connection to Kushina that is related to his demonic powers. For example, her Uzumaki bloodline might be the key to controlling or understanding his demonic side better. And they could go on a journey to discover the secrets of his powers together.
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.
Well, a really interesting plot could be a fanfiction where Mikoto and Kushina's spirits are somehow able to communicate with Naruto at crucial moments in his life. They give him advice and strength, even though they are no longer alive. Also, a story about how they worked together to try and bridge the gap between the Uchiha and the rest of the village would be fascinating. They could use their influence and relationships to bring about positive change. This would involve a lot of character development for both of them and would show their importance in the Naruto world beyond just being Naruto's mother and a friend's mother.
One idea could be that the evil Naruto tries to manipulate Kushina's power for his own dark purposes. Maybe he wants to take over the Hidden Leaf Village using her influence as his mother. Another could be that he forms an alliance with the village's enemies, and Kushina has to make the tough choice between stopping her son or trying to save him from his evil ways.