Another theme is friendship and love. The harem aspect usually involves Naruto forming relationships with multiple Sailor Moon characters. These relationships explore different types of love, from platonic to romantic, and also highlight the importance of friendship among the characters as they navigate this new and strange situation together.
A common theme is the clash of different power systems. Naruto has ninja techniques and chakra, while Sailor Moon has the power of the Sailor Scouts. Writers often explore how these powers interact when the characters are in a harem - style relationship. Another theme is the cultural differences between the two universes. Naruto is set in a more feudal - like ninja world, and Sailor Moon has a more modern - day, magical girl setting.
Maybe a corrupted version of one of the Sailor Scouts. She could be jealous of Naruto's attention towards the other Scouts in the harem. So, she makes a deal with a dark force from Naruto's world, like a powerful Orochimaru - like character. This combined power of dark jutsu and a twisted Sailor power would create a very interesting and complex main antagonist for this crossover fanfiction.
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.
The character interactions are also quite unique. Imagine Naruto's brash and determined personality meeting Sailor Moon's kind - hearted and somewhat naive nature. It creates a whole new dynamic. Fanfiction writers can explore different relationships between the characters from both series, like friendship, rivalry, or even romance. This can lead to some very interesting storylines that you wouldn't find in the original series.
Tuxedo Mask could also be in the harem. He has a long - standing relationship with Usagi, and in a harem scenario, his feelings for her could be even more intense, competing with others for her love.
Another one to check out is 'Naruto and the Sailor Moon Harem'. This fanfic delves into the relationships that Naruto forms with the Sailor Moon characters. It shows how his presence disrupts and also enriches the existing relationships in the Sailor Moon world, all while building a harem - centered story.
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.
Obviously Sailor Moon herself. Her kind - hearted and brave nature would make her a great addition to the harem. And also Sakura from Naruto. She's strong - willed and has a long - standing relationship with Naruto that could develop further in this fanfiction.
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.