One plot idea could be a crossover where Naruto and Inuyasha are transported to a new world together and end up attracting a harem of unique characters. They could team up to protect these characters from a common enemy while also dealing with the romantic interests. Another idea is that a powerful magic or jutsu causes a group of female characters from both Naruto and Inuyasha universes to be drawn to Naruto and Inuyasha, creating a harem situation full of comical misunderstandings and adventures.
One plot idea could be that Naruto and Inuyasha are somehow transported to a new world where they encounter a group of unique female characters. They have to work together to survive and in the process, a harem situation starts to develop as the girls are attracted to their different qualities. Naruto's determination and Inuyasha's rough - edged charm draw the ladies in.
A cool plot could be that there's a tournament across different anime worlds, and Inuyasha and Naruto are chosen to represent their respective worlds. Along the way, they discover similarities in their pasts, like both having some form of demon - related heritage (Naruto with the Nine - Tails and Inuyasha being a half - demon). They also exchange combat techniques. Naruto teaches Inuyasha how to better use chakra control in his attacks, and Inuyasha shows Naruto some unique sword - fighting skills.
The descendant might be born into a time of great unrest in the Naruto world, but their Inuyasha - related powers give them an edge. They could start off as an outcast because of their strange powers, but as they grow and develop, they become a key figure in a conflict. For instance, they might be the only one who can communicate with a group of demons that are encroaching on the ninja villages. By using their unique heritage, they can negotiate peace or, if necessary, fight to protect their home using a combination of ninjutsu and Inuyasha - style combat.
One plot idea could be a story where Fem Naruto and Inuyasha team up to fight a common enemy. Maybe a powerful demon that has the ability to disrupt the balance between the ninja world and Inuyasha's feudal Japan. They could combine their unique powers, like Naruto's ninja skills and Inuyasha's swordsmanship and demon powers.
A really unique plot could be a situation where the tailed beasts in Naruto are related to the powerful demons in Inuyasha. For instance, the Nine - Tailed Fox could have a connection to a major demon in Inuyasha's world. This discovery could lead to a journey where Naruto has to travel through the Inuyasha world with Inuyasha and Kagome to find out the truth about this connection and how it can help or harm their respective worlds.
One interesting plot idea could be that Naruto somehow gets transported to the Inuyasha world. He teams up with Inuyasha and they have to face a common enemy, like a powerful demon that is threatening both the ninja world and the feudal Japan world. Naruto's unique jutsu combined with Inuyasha's sword skills would make for some epic battles.
One idea could be that Naruto, with his ninja skills, gets transported to Starfire's universe. There, his unique abilities draw the attention of many characters, leading to the formation of an accidental harem. For example, his ability to make shadow clones might be seen as a very useful and cool power. Another plot could involve a common enemy that forces Naruto and Starfire, along with other characters who are part of the harem, to work together. This could lead to some interesting dynamics as they all come from different backgrounds and have different ways of fighting.
One idea could be that a Saiyan character somehow ends up in the Naruto universe and due to their unique powers, attracts a harem. For example, they might save a group of ninja from a powerful enemy using their super strength and speed, and the ninja, both male and female, become intrigued by this new and powerful being.
One idea could be that Naruto and Deadpool end up in a strange multiverse situation where they meet various female characters from their respective universes. They then have to team up to protect these females from a common enemy, and in the process, a harem - like dynamic forms as the female characters develop feelings for them.
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.