Perhaps Naruto is revived as part of a deal made by the spirits of the past Hokages. They make a pact with some dark force that they will give up something in return for Naruto's life. Naruto then has to deal with the consequences of this deal. He might have to face the dark force that brought him back at some point. Also, he has to figure out how to break the deal without causing harm to the village and his loved ones.
Another plot could involve Naruto being revived due to the strong will of the people. In the Naruto universe, the will of the people can have a strong influence. So, all the people who Naruto has helped and inspired over the years unconsciously create a kind of spiritual energy. This energy is noticed by a sage or some other powerful being who uses it to bring Naruto back. Once revived, Naruto uses his new - found spiritual connection with the people to fight an even greater evil.
One possible plotline could be that Naruto is granted wings as a result of some ancient and powerful jutsu he accidentally activates. With the wings, he could gain new abilities like enhanced speed in the air and new combat techniques. For example, he might be able to use the wind generated by his flying to create more powerful Rasengan attacks. Another plotline could be that the wings are a gift from a mysterious being who sees Naruto's pure heart and wants to help him in his fight against evil. He then has to learn to control the wings and use them to his advantage in battles against stronger opponents.
In the fanfic, it might be set in an alternate universe where Sakura has a different personality. She could be more aggressive and competitive with Naruto. During a sparring match, she goes too far and seriously hurts Naruto. This could then be the starting point of a story about Naruto having to forgive her and them rebuilding their friendship.
One possible plotline could be that Naruto gets an eye transplanted from an Uchiha. This new eye might give him the ability to use Sharingan techniques. He could struggle at first to control it, like Sasuke did when he first awakened his Sharingan. It might also change his perception of the ninja world, as he now has a power that was once exclusive to the Uchiha clan.
Perhaps in the fanfiction, Tobirama's sickness makes him weak and he starts to reflect on his life and the choices he has made. He could have conversations with his loved ones where he reveals his regrets or hopes. This introspective side of him due to the sickness could add depth to his character. Also, his sickness might be a catalyst for changes in the village he has helped build, as others step up in his absence.
One possible plotline could be that Loki meets a girl in a different realm. Maybe she's a powerful sorceress who initially challenges him. As they cross paths more often, they start to see each other's true selves. Loki, who is used to being alone and distrusted, slowly opens up to her. Their relationship could be filled with banter and magical adventures as they face threats to their realms together.
A plot could involve Sarada getting hurt in a trap set by a villain. The villain might be targeting the new generation of ninja in the village. As she gets injured, it sets off a chain of events where her friends start to investigate the incident. Sarada, while hurt, could provide some crucial clues from what she saw before getting injured. This would not only be about her physical injury but also about her mental strength as she tries to contribute to the solution while in pain.
One possible plotline could be that Naruto leaves the village due to some sort of political unrest. He meets a girl from another land during his travels. They bond over their shared experiences of being outsiders in a way. As they travel together, they face various challenges like bandits and natural disasters. Their relationship deepens through these hardships and they eventually decide to get married. It could also involve Naruto teaching his new partner about the ninja way.
One possible plotline could be that Robin's friends have to take care of him in his kid form. They might struggle with things like getting him to school or dealing with his childish tantrums. Another could be that Robin in his kid form has some special powers or abilities that he doesn't have as an adult, which could lead to all sorts of adventures. For example, he might be able to communicate with animals more easily.
One possible plotline could be that Sora and Kairi finally reunite after all their adventures. They might go on a journey together to a new world where they discover more about each other's feelings. They could face some challenges along the way, like an old enemy trying to separate them, but in the end, they realize their love for each other is stronger than any obstacle.
Perhaps Bakugou gets expelled due to his attitude problems. He might have continuously bullied a fellow student to the point where the school can't overlook it anymore. His explosive temper could lead to him saying or doing something really offensive to a teacher or a large number of students, which would be against the school's code of conduct.