One possible plotline could be an alternate universe where Futa Kushina has unique ninja abilities that she uses to protect Naruto in a different way than in the original story. Maybe she has some special time - space jutsu that allows her to foresee and prevent certain threats to Naruto.
Another plotline could involve Futa Kushina being part of a secret organization that Naruto discovers later in his journey. This organization might have its own goals and motives related to the shinobi world's balance, and Kushina's role within it could lead to many adventures and revelations for Naruto.
One interesting plot could be that in this fanfiction, Futa Kushina has some special abilities that she passes on to Naruto in a unique way. For example, it could be a power that allows Naruto to communicate with spirits more effectively, which then helps him in his battles and in understanding the history of the ninja world better. Another plot might involve Futa Kushina coming back to life briefly and training Naruto in a forgotten ninja art that gives him an edge over his enemies. Maybe this art has something to do with space - time manipulation on a smaller scale, like being able to quickly move between short distances without being detected.
One interesting plotline could be exploring how they first fell in love. Maybe it was during a training session where Naruto showed his determination and Kushina was drawn to that. Another could be them facing challenges together, like dealing with the village's disapproval of their relationship at first.
One interesting plotline could be Naruto being transported back in time to when Kushina was young and him having to navigate a harem situation while also trying to change the future for the better. Another could be an alternate universe where Kushina is in a position of power and Naruto has to win her over among a group of suitors in a harem-like setting.
Another plotline could involve the challenges they face from the village. People might have different opinions about the union, some seeing it as a strategic move while others might be jealous or against it for various reasons. They would have to deal with the gossip and political implications within Konoha.
One possible plotline could be Kushina getting to train Naruto personally. Since she was a powerful kunoichi, she could pass on her unique skills and knowledge. This would make Naruto even more formidable at an earlier stage. Another plotline might involve Kushina's influence on Naruto's relationships. For example, she could have a big impact on how Naruto interacts with Sasuke, perhaps helping to prevent some of the rifts that occurred between them in the original story.
One possible plotline could be Kushina's reunion with Naruto and how she uses her skills and wisdom to help him in his battles. For example, she might teach him some new jutsu that only she knew. Another plotline could involve Kushina exploring the new ninja world that has changed so much since her time. She could interact with characters like Sasuke and Sakura, and have an impact on their development as well.
Another plotline might involve Kushina being brought back to life and getting to know Naruto as a young man. As she spends time with him, she discovers his determination and the way he has grown despite his hardships, which makes her develop feelings for him. For example, she could see how he interacts with his friends and how he's always there to protect them, and that could draw her to him.
One possible plotline could be Naruto exploring his mother's past in more detail. Maybe he discovers some hidden jutsu or secrets that Kushina left behind. Another could be his relationship with his parents in a more in - depth way, like how they would have raised him if they were alive.
One possible plotline could be Naruto and Kushina teaming up to face an extremely powerful enemy that no one else in the village can handle. Their godlike powers would be put to the test in protecting Konoha.
One plotline could be that Naruto discovers a hidden power within himself that is linked to Kushina's Uzumaki heritage. This power makes him godlike, and he has to learn to control it while also dealing with the memories and emotions related to Kushina that come with it.