In some fanfictions, there could be a situation where Naruto has an accident and Kushina has to take care of him. During this time, she gets to know his inner thoughts and dreams on a deeper level. His vulnerability during his recovery makes her look at him in a new light, and she starts to have romantic feelings for him.
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 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.
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 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 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.
One interesting plotline could be Minato and Kushina returning during the Fourth Great Ninja War. They could turn the tide of the battle with their powerful skills. Minato's Flying Raijin would be a great asset, and Kushina's chakra chains could help in restraining powerful enemies. Another plot could be their return and how they interact with Naruto, teaching him new jutsus and sharing their experiences.
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.
One interesting plotline could be Naruto finding a hidden journal of Kushina's that reveals secrets about their family or the village. Another is Kushina guiding Naruto in his dreams to master a new jutsu.
One interesting plotline could be Kushina's influence on Naruto's chakra control. Since she was a jinchuriki too, fanfics might explore how she could have taught Naruto some unique techniques related to the Nine - Tails' chakra if she had been alive longer.