There could also be a plotline where Kaguya has some knowledge or power that Naruto needs to save the ninja world from a future disaster. So Naruto has to convince Kaguya to share this knowledge or power with him. This would create a lot of tension and interesting character interactions as they both have different motives and personalities, yet need to cooperate for the greater good.
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.
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.
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.
Well, a great plotline could be the exploration of Kaguya's family. Naruto could be on a quest to find out more about Kaguya's descendants and how they are related to the current ninja clans. This could lead to some interesting revelations about the origins of certain jutsus and the hidden secrets of the ninja world. Also, a plot where Naruto and Kaguya team up to stop an ancient evil that was sealed away long ago but is starting to break free is really exciting.
Maybe in the fanfiction, Kaguya's power is split among several individuals in the Naruto world and Naruto has to find a way to reunite it without causing chaos. Along the way, he discovers hidden secrets about Kaguya's origin and her true intentions.
A great fanfiction idea is a story set in an alternate universe where the Kaguya Clan was never ostracized. In this universe, they play a major role in the shinobi world. It could explore how their different kekkei genkai abilities would have shaped the politics, culture, and power dynamics of the ninja world in a positive way.
One interesting plot could be the exploration of new powers that emerge when Naruto and Kaguya are merged. For example, perhaps a new form of chakra that combines Naruto's life - affirming energy with Kaguya's ancient and powerful chakra. Another plot might involve how the ninja world reacts to this new entity. Do they see it as a threat or a new source of hope? Also, the merged Naruto - Kaguya could have a unique perspective on the history and future of the ninja world, which could lead to revelations about hidden secrets or new ways to prevent future disasters.
One interesting fanfiction could be about Kaguya's life before she became the all - powerful being. It might explore her relationships with other Ootsutsuki members and how she came to be on Earth. Another could be a story where Naruto has to face a new threat related to Kaguya's past that was previously unknown. There are also fanfictions that might rewrite the final battle with Kaguya, giving it a different outcome and a new direction for the Naruto universe.
One possible plotline could be that Naruto discovers Kaguya's true past and the reasons behind her actions. He might show her compassion and convince her to abandon her evil ways. For example, Naruto could use his talk - no - jutsu to make Kaguya realize the value of life and the potential for a better future. Then he could save her from self - destruction or the wrath of other powerful enemies.