A really cool plot could be that Naruto's Rinnegan gives him the ability to see into different timelines or dimensions. He and Naruko then embark on a journey to find a way to save their world from a future disaster that he has seen through the Rinnegan. Along the journey, they grow closer and their relationship deepens as they face various challenges.
One interesting plot could be Naruto time - traveling back to his childhood and meeting a female version of himself, Naruko. They could team up to change the future of the Hidden Leaf Village. Maybe they work together to prevent certain tragedies that happened in the original timeline.
Maybe a new organization of rogue ninjas that see Naruto's Rinnegan as a threat to their own goals of taking over the ninja world. They target Naruko as a way to get to Naruto. These ninjas could have some unique and powerful jutsus of their own, making them formidable antagonists.
One interesting plot could be Naruto using the Rinnegan's powers in unique ways during battles. For example, he might combine the Rasengan with the Deva Path's ability to attract and repel, creating a new and powerful attack.
Well, one possible plot could be that Naruto's Rinnegan gives him the ability to understand and communicate with all living things on a deeper level. So he can use this to broker peace between warring factions in the ninja world. He might be able to sense the true intentions of people and prevent conflicts before they start. It could also mean that he has a new understanding of chakra and how to use it in ways that were previously unknown, like combining different types of chakra in unique ways.
One possible interesting plot could be Naruto discovers a hidden ancient scroll that details the secrets of awakening the Rinnegan. He then embarks on a dangerous journey filled with various trials and battles against powerful enemies who also want the power of the Rinnegan for themselves.
One possible plot could be that Naruko, with her ninja skills, teams up with Spiderman in a city under siege by a new super - villain. Their different fighting styles and powers would make for an exciting combination. For example, Naruko could use her shadow clones to distract the villain while Spiderman swings in and takes them by surprise with his webs.
In some 'naruto and naruko harem fanfiction', there might be a plot where Naruto has to choose between Naruko and other potential love interests. This creates a complex web of relationships and emotions as he tries to figure out his true feelings. It also shows how the harem concept affects the characters' growth and decision - making.
One possible plot could be Naruto and Naruko being banished unjustly and then having to prove their worth outside the village. They might encounter new allies and enemies, and develop new jutsu in the process.
One interesting plot could be Naruto using his time - travel ability with the Rinnegan to go back and prevent the Uchiha massacre. This would completely change the course of the Naruto world. He could try to reason with Itachi and the elders, and maybe find a way to end the conflict without all that bloodshed.
One interesting plot could be Naruto and Naruko traveling back to the time when the Uchiha clan was about to be massacred. They could try to prevent it, which would change the whole future of the ninja world. Maybe they use their future knowledge and skills to stop Itachi from carrying out the order.