A possible plot could be that the nine - tailed fox inside Naruto has some sort of connection to an ancient power in the Sailor Moon universe. This connection brings Naruto into the Sailor Moon world. The Sailor Scouts are intrigued by Naruto and the power within him. For the harem element, the Scouts find themselves competing for Naruto's attention in a friendly way. They teach Naruto about their world and magic, while he teaches them some ninja techniques. Together, they face challenges that test their newfound relationships and their combined powers.
One idea could be that Naruto somehow gets transported to the Sailor Moon universe. In this new world, the Sailor Scouts initially see him as an oddity but gradually come to respect his ninja skills. As for the harem aspect, Naruto's kind heart and unique abilities attract the Scouts, leading to a series of adventures where they all have to work together to protect both their worlds from a common threat. Maybe a new villain emerges who combines the dark jutsu of Naruto's world and the dark magic from the Sailor Moon world.
Well, perhaps Naruto has a special power that is needed to save both his world and the Sailor Moon world. As a result, the female characters from both Naruto and Sailor Moon start to develop feelings for him. For example, Sailor Moon might be drawn to his never - give - up attitude, while Sakura from Naruto could see a new side of him in this strange new setting.
One idea could be that Usagi, being the kind-hearted leader she is, gradually forms a harem of characters who are drawn to her pure heart and strong sense of justice. For example, the various Sailor Scouts could develop deeper feelings for her beyond just friendship, leading to a complex web of relationships.
One idea could be that the OC is a new senshi from a far - off planet who arrives on Earth just as a new threat emerges. The Sailor Scouts are initially suspicious but soon realize they need all the help they can get.
One interesting plot idea could be a time - travel scenario where Sailor Moon goes back in time to prevent a major event that led to the rise of a powerful enemy. Another could be a crossover with another popular anime, like having Sailor Moon meet Naruto and they team up to fight a new threat.
Perhaps Naruto gets lost in a parallel dimension where he meets Sailor Mars. At first, they don't understand each other but as they face challenges together, like fighting off strange creatures in that dimension, they start to learn from one another and develop a bond. Their different fighting styles could lead to some really cool battle scenes in the fanfiction.
Well, in Sailor Moon dark fanfiction, a cool plot could be the Sailor Guardians facing an enemy that can manipulate their worst fears. This would make them question their own abilities and loyalties. Also, a story where the power source of the Sailor Guardians is somehow tainted, turning their powers dark and making them struggle to control it. Or perhaps a plot where a new dark Sailor Guardian emerges, with powers equal to or greater than Sailor Moon's, causing chaos in the magical world.
One idea could be that the characters from RWBY end up in the Sailor Moon universe and have to learn the ways of the Sailor Scouts. For example, Ruby could be intrigued by Sailor Moon's transformation and try to adapt her Crescent Rose to work in that magical world.
An interesting plot could be that Goku and Sailor Moon meet during a multiverse tournament where representatives from different anime universes are competing. They initially don't get along because of their different fighting styles and beliefs, but as the tournament progresses, they realize they can learn from each other. Together, they face off against a cheating opponent who is using unfair tactics to win. Through their combined efforts, they not only defeat the opponent but also learn to respect each other's worlds and ways of fighting.
One idea could be a story where a new Sailor Guardian emerges from a different dimension and has a unique power that can either help or hinder the fight against the Black Moon Clan. For example, she might be able to manipulate time in a different way than Sailor Pluto. Another plot could involve a member of the Black Moon Clan who has a change of heart and decides to secretly assist the Sailor Guardians. This would create a lot of internal conflict within the clan.
Well, a cool plot might be that the Dragon Balls are stolen by an evil force from the Sailor Moon universe. So, the Z Fighters have to travel to that universe to retrieve them. Along the way, they meet the Sailor Scouts and realize they need to work together. The Sailor Scouts could also learn about the power of the Dragon Balls and how they can be used for good. They might even help the Z Fighters in their search by using their unique powers to track down the stolen balls.