Naruto's skin might start to glow with a strange energy, similar to how Kaguya seemed to have an otherworldly aura. His eyes could change color to something more like Kaguya's, perhaps a deeper, more mysterious hue. And his clothing might even transform to be more in line with Kaguya's style, as if the absorption of her power also influenced his physical form in that way. He might also grow taller or more muscular as a result of the new power coursing through his body.
Well, if Naruto absorbs Kaguya in a crossover fanfiction, it could drastically change the power balance. Naruto already has a lot of power, and adding Kaguya's abilities would make him nearly invincible. It might also change his relationships. His friends could be in awe or a bit scared of his newfound power. And it would surely change the way he faces future enemies. Instead of just fighting, he could potentially just overpower them with his new combined abilities.
Well, when Naruto absorbs the Juubi in a crossover fanfiction, his appearance would be a visual representation of his new power. He could have some sort of chakra horns or spikes protruding from his body, similar to some of the forms of the tailed beasts. His eyes might become more slitted and have a more menacing look. The overall look would be a blend of Naruto's original appearance and the terrifying and powerful essence of the Juubi, making him look both familiar and yet completely different at the same time.
His relationship with Sasuke would likely be affected. Since Sasuke has a connection to the Uchiha and Naruto now has Madara's power, there could be a new dynamic. Sasuke might be both wary and intrigued by Naruto's new abilities. Naruto's relationship with the Hidden Leaf Village would also change. People would view him with a mix of awe and fear. The elders might be more cautious around him, while the younger generation would look up to him even more.
If Naruto absorbs Kaguya in a fanfic, it might lead to a very different storyline. He could use Kaguya's power to bring about a new era of peace more quickly. For example, he might be able to use her power to stop all forms of aggression instantly. Also, his appearance might change slightly, taking on some of Kaguya's physical traits. And his understanding of the chakra and the world's origin could be greatly enhanced.
The Naruto world would be turned upside down. With Naruto being raised by Kaguya, his understanding of chakra and the ninja way would be completely different. He might introduce new forms of jutsu based on Kaguya's ancient knowledge. The balance of power among the ninja clans would be disrupted. His upbringing by Kaguya could also lead to a change in the social structure of the ninja villages. For example, he might promote a more hierarchical system similar to what Kaguya might have been used to, instead of the more democratic - ish system that was in place in the original story.
The power dynamics would shift significantly. Naruto already being very powerful, with the connection to Kaguya, he might be seen as an even greater threat or asset. Allies and enemies would likely reevaluate their relationships with him.
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.
Well, Naruto could change Kaguya in the fanfiction by introducing her to the concept of redemption. Given his own journey of facing his inner demons and coming out stronger, he might convince Kaguya that she can atone for her past sins. He may take her on a journey through the ninja world, showing her how people have rebuilt and thrived despite the chaos she once caused. This could make her re - evaluate her actions and change her perspective on the world and her place in it.
She might have Naruto's blond hair but with a more ethereal quality like Kaguya's. Her eyes could be a blend of Naruto's blue and Kaguya's red - purple, giving her a very striking look. She would probably have Naruto's general body structure but with Kaguya's grace and elegance in movement.
His friends might be initially shocked. Sakura could tease him about it at first but then grow to like the new look. Sasuke might be indifferent on the surface but secretly find it interesting. His enemies might underestimate him, thinking he's become more of a softie with the long hair, but then be surprised by his unchanged combat skills.