Perhaps an evil Kushina could be jealous of the attention Naruto gets from others in the village. So she starts to plot against him, creating all sorts of false accusations and challenges for Naruto. Naruto then has to not only prove his innocence but also try to figure out what made his mother turn evil and if there's a way to save her.
One common plot is Kushina finding Naruto in a different time or dimension. For example, she might end up in the future where Naruto has grown up and she gets to see the kind of person he has become. It's an emotional and interesting concept as she gets to witness all his achievements and the challenges he has overcome.
Perhaps a plot where Kushina and Naruto team up to uncover the secrets of the Uzumaki clan. They travel to different places, meet long - lost relatives or find ancient Uzumaki artifacts that hold great power. This journey would not only strengthen their bond but also uncover hidden powers within Naruto.
One interesting plot could be that drunk Naruto accidentally time - travels back to when Kushina was alive. He, in his drunken state, reveals some future events in a muddled way which confuses Kushina but also gives her a sense of hope for the future of the village. Another plot could be that Kushina finds drunk Naruto passed out and takes care of him. As he wakes up, he mistakes her for Hinata at first and then they have a heart - to - heart about family and the village.
One interesting plot could be Naruto being transported to an alternate dimension where Kushina is part of a harem. He has to navigate the complex relationships within the harem while also dealing with new threats in this dimension. Another plot might involve Kushina having to choose between different suitors in the harem setting, all while Naruto is trying to protect her and the village.
One possible plot could be that Kushina is captured by an old enemy who wants to use her connection to Naruto to lure him into a trap. Naruto then has to gather his friends and come up with a clever plan to rescue her. Maybe they have to face off against powerful ninjas that the enemy has hired.
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 interesting plot could be a story where Naruto gets to time - travel and meets his mother Kushina and Mikoto when they were young. He could then use his knowledge from the future to change some events in a positive way.
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 possible plot could be that Kushina's survival changes Naruto's upbringing completely. Instead of being an orphan, he grows up with a loving mother. She could teach him advanced Uzumaki clan techniques early on, making him even more powerful in the ninja world.
Well, perhaps a plot where the harem members in the 'evil naruto harem fanfiction' have to deal with the consequences of being associated with an evil Naruto. They might face opposition from the regular Naruto's friends and have to fight to protect their relationship with him. It could also involve the harem members trying to change Naruto from his evil ways, leading to some really emotional and tense moments.