Well, a plot could be that Kushina is a reincarnated goddess. She doesn't know it at first, but she starts having strange dreams and premonitions. As she discovers her true nature, she has to learn how to use her goddess - like abilities, which include things like super - speed and the power to heal any wound. She then uses these powers to fight against a new and powerful enemy that threatens the ninja world.
Perhaps in the fanfiction, Kushina is a goddess who has been sent to the Naruto world to restore balance. The world has been thrown into chaos due to the misuse of chakra. Kushina uses her unique powers, which are different from normal ninja techniques. For example, she can communicate with animals and plants and enlist their help in her mission. Along the way, she meets Naruto and realizes that he has a special role to play in the restoration of balance as well.
One plot could be that Kushina was always a goddess, but she chose to live as a normal ninja in the Hidden Leaf Village to experience mortal life. However, when the village is in great danger from an ancient evil, she reveals her true form and powers. Her powers are not just physical but also spiritual. She can enter the minds of her enemies and turn them against each other. She then leads the village to victory, but has to decide whether to continue living as a normal ninja or embrace her full goddess status.
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.
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 gets to time - travel and meets his mother when she was his age. It would be a great chance to see their relationship develop in a different way.
One idea could be that the death goddess has the power to bring back characters from the dead in the Naruto universe, but at a great cost. Maybe she offers Naruto this chance to revive his parents, but in return, he has to sacrifice some of his own chakra forever.
One idea could be that the cat goddess uses her powers to help Naruto master a new form of jutsu. Maybe she can see the potential in Naruto that others overlook and guides him in a spiritual journey to unlock this power. For example, she might lead him to a hidden place in the forest where he can train without distractions.
A possible plot is that an evil force is threatening the world, and only Naruto, with the help of his goddess harem, can stop it. The goddesses each have a piece of the solution. A fire goddess has the ability to create a powerful shield, a earth goddess can manipulate the terrain to their advantage, and Naruto has to bring them all together to defeat the evil.