One interesting aspect is the power - scaling. When Naruto is godlike, his abilities are far beyond the normal scope, and seeing how he interacts with Kaguya, who is also extremely powerful, creates exciting battle or cooperation scenarios.
There is a fanfic called 'Godlike Naruto and the New Era with Kaguya'. It delves into a scenario where Naruto has achieved god - like status and how that changes his relationship with Kaguya. The story also explores how their combined powers can reshape the Naruto world, with detailed descriptions of their new abilities and the impact on other characters.
One possible plot could be that Naruto, in his godlike state, tries to understand Kaguya's past and motives more deeply. He might use his newfound power to communicate with her on a different level, perhaps even showing her a different way of seeing the world. This could lead to a redemption arc for Kaguya, where she starts to regret her past actions.
It would change it completely. A godlike Naruto would have more power than Kaguya, so she would be in a position of relative weakness for once. This could make her more defensive or even fearful at first.
One possible plot could be that Naruto, under Kaguya's training, gains godlike powers at an accelerated rate. He might learn ancient and powerful jutsu that were once exclusive to Kaguya. This could lead to him facing new and extremely powerful enemies, perhaps even threats from other dimensions. With Kaguya's guidance, Naruto could also gain a deeper understanding of the chakra and its origins, and use this knowledge to reshape the ninja world for the better.
One potential antagonist could be those who fear Naruto's new - found godlike powers. There might be ninja from other villages who see Naruto as a threat to the balance of power. Another could be remnants of Kaguya's old enemies who resurface, seeing Naruto as a continuation of Kaguya's influence and wanting to stop him. Also, there could be dark forces within the ninja world that want to corrupt Naruto's new powers for their own evil purposes.
Kakashi can be a popular character too. His wisdom and combat skills can be useful in fanfic scenarios involving Kaguya. He could be a mentor figure to Naruto, guiding him in dealing with Kaguya - related threats or helping to decipher ancient ninja knowledge related to Kaguya.
One plot idea could be that Naruto, in his godlike state, has to train Kaguya to adapt to the new ninja world. Since she has been out of touch for so long, Naruto teaches her about new jutsus and ninja ethics.
One common theme is redemption. Since Kaguya was initially a villain, many fanfics explore her journey towards redemption with Naruto's help. Another theme is power. How their combined powers can be used for different purposes, like protecting the ninja world. For example, in some fanfics, they use their powers to fight off a new threat that is stronger than any they've faced before.
One good Naruto x Kaguya fanfic is 'The Last Dance'. It explores an alternate universe where Naruto has to team up with Kaguya against a new, powerful enemy. The story does a great job of building their relationship from mutual distrust to a deep understanding.