One idea could be that Naruto is somehow transported to the Overlord world and his unique abilities draw the attention of various female characters, leading to a harem situation. Maybe his ninjutsu skills are seen as a form of magic there.
One idea could be that Ainz Ooal Gown somehow ends up in the Naruto world. He could start by trying to understand the new world's power system. Maybe he'd initially be mistaken for a powerful jutsu user or a new type of tailed beast. Another plot could involve Naruto's friends being curious about Ainz's undead minions and trying to befriend them, while Ainz is cautious as he doesn't fully trust the inhabitants of this strange new world.
One idea could be that the demon overlord has a hidden past with Naruto's family. Maybe he was once an ally but was betrayed, and now he's back for revenge while Naruto tries to understand the truth.
The OC could be a descendant of a powerful clan that was thought to be extinct. Their presence in the Naruto world stirs up interest among many characters. The OC's knowledge of ancient jutsu and their kind heart draw in characters like Kakashi, Shikamaru, etc. into a harem. The OC then has to navigate the complex relationships while also trying to keep their clan's secrets safe.
Perhaps the fanfiction could explore how the daimyo's harem affects the political situation in the Naruto world. The different members of the harem might have connections to various factions, and the daimyo has to balance these relationships to maintain peace.
Maybe Naruto was born blind in this fanfiction. However, his determination and positive attitude attract a group of girls. They see his inner strength and beauty, and as the story progresses, Naruto trains hard to become a powerful ninja in his own way, and the harem girls are there to cheer him on and help him out in battles.
Perhaps in this fanfiction, Haku survives and Naruto, through his unique ability to see the good in people, helps Haku fully integrate into the village. As a result, more female ninjas are attracted to Naruto's inclusive nature, and Haku becomes a central figure in a harem - like scenario where they all share a special connection with Naruto. This connection could be based on mutual respect and admiration for Naruto's growth as a ninja.
One idea could be Naruto forming a unique bond with each member of the harem in different ways. For example, with Konan, he might discover her love for art and they could bond over creating origami together. Another could be Naruto teaching his harem members some of his ninja techniques, which would lead to interesting training sessions and character development.
One plot idea could be that Naruto somehow gets transported to the world of Arrancars. He then starts to form relationships with different Arrancar characters, leading to a harem situation. Maybe he uses his ninja skills to protect them from other threats in their world, and in the process, they all fall for him.
Perhaps in the fanfiction, Naruto and Ayame start a mission together that leads to them getting stranded in a strange land. There, they gradually form a harem as they meet various characters who are attracted to their unique qualities and the bond between them.
One idea could be that the main character, who has traits from both Naruto and Yugioh universes, accidentally creates a portal that brings together characters from both worlds into a shared space. In this new space, a harem starts to form around him as characters from different backgrounds are intrigued by his unique abilities. Another plot could involve a tournament where the rules are a mix of Yugioh duels and Naruto - style battles, and the winner gets to be part of a special harem.