One interesting plotline could be the exploration of different relationships within the harem. For example, how Naruto interacts with each member in a unique way. Maybe he has to resolve conflicts between the harem members who might be jealous of each other.
Another plotline could involve Kaguya's role in the harem. Since she is a very powerful character, she could be either a source of protection or a potential threat to the harmony of the harem. The fanfiction might explore how Naruto tries to keep Kaguya in check while still maintaining a relationship with her.
One interesting plotline could be Kaguya's return and her attempt to make amends for her past actions. Naruto, being the protagonist, could be the one to help her in this journey of redemption. This would show a different side of both characters and how they grow together in this new situation.
One possible plotline could be Kaguya using her powers to manipulate Naruto into fighting his friends. She might twist his perception of right and wrong, creating chaos in the ninja world. Another could be Kaguya trying to use Naruto as a vessel to regain her full power and reshape the world according to her will.
A great plotline could be Kaguya trying to understand human emotions better through her love for Naruto. She has been detached from the normal world for so long that this new experience is completely foreign to her. So, she starts to learn about friendship, loyalty, and sacrifice from Naruto and his comrades. This could lead to her making amends for her past actions. Also, there could be a plot where Naruto helps Kaguya find a new place in the ninja world. Since she was once an enemy, it's not easy for her to fit in, but with Naruto by her side, she slowly gains acceptance and they face various challenges together, like dealing with old grudges from other ninja clans.
Another plotline could be a time - travel story. Maybe Naruto is sent back in time and meets a younger Kaguya before she becomes the evil being she is in the original story. He tries to change the course of history by influencing her and preventing the future tragedies. This would involve a lot of character interaction as Naruto tries to teach Kaguya about things like love, friendship, and the importance of peace, which she was deprived of in her own upbringing.
One idea could be Naruto having to navigate the complex relationships within the harem. He might face challenges like jealousy among the members. For example, some characters could be vying for more of Naruto's attention. Another plot idea could be the group working together to face a new threat that is related to Kaguya Ootsutsuki's past. They would need to combine their powers and skills to overcome it.
One idea could be that Naruto, after achieving great power, somehow travels back in time and meets Kaguya before she turned evil. He then forms a harem with her and some other female characters from the Naruto universe who are also drawn to his unique power and kind heart.
Another plotline could involve the female characters in the harem having unique powers or abilities that they use to help Naruto in his battles. Maybe one of them has a special healing ability that comes in handy during a tough fight. And as they work together, their relationships deepen.
One interesting plotline could be the female Naruto having to deal with the different dynamics of a harem. For example, she might have to balance the affections of various male characters who are now vying for her attention in a new way. Maybe she uses her ninja skills in unexpected ways to handle the situation, like using her shadow clone jutsu to be in multiple places at once to manage all the relationships.
Well, one plotline could be about how the different female characters in Naruto's harem support each other during their pregnancies. They might share their experiences, fears, and joys. Another could be centered around Naruto himself, as he tries to balance his ninja duties with taking care of his pregnant partners. For example, he might have to go on a mission while also making sure his partners are safe and comfortable at home.
One interesting plotline could be the development of relationships between Naruto and the various characters in the harem. For example, how he overcomes cultural differences among them. Another could be their adventures together against common enemies, with each member of the harem contributing their unique skills.