Another scenario could be that Naruto and Sasuke discover a new power within themselves during the fight against Kaguya. This new power could be related to their friendship or their connection to the Sage of Six Paths. They then use this power to finally defeat Kaguya.
Most likely Naruto and Sasuke. In the original series, they were already very powerful when they faced Kaguya, and in fanfiction, they could be even more so. Their combined strength and determination usually make them the favorites to win.
Naruto. His positive attitude and never - give - up spirit often inspire Sasuke. Also, his ability to connect with people gives them an advantage. He can rally support from unexpected places and his chakra is always a big boost in tough battles.
One exciting moment could be when Naruto and Sasuke combine their powers in a new and unexpected way. For example, they might create a unique jutsu that gives them an edge against Kaguya. It's always thrilling to see how they work together, especially considering their complex relationship.
In a fanfiction, their relationship could develop through shared knowledge. Naruto is curious about the history of the ninja world which Kaguya knows a great deal about. As he asks her questions and she shares her stories, they start to bond. Also, Kaguya could be intrigued by Naruto's determination and his never - give - up attitude. This could lead to a relationship where Kaguya becomes a sort of mentor to Naruto in some ways, while Naruto helps Kaguya to see the good in the current ninja world. Their relationship would then be a mix of learning and mutual admiration.
At first, it might be one of suspicion. Naruto would be wary of Kaguya's power and her past as a sort of villain. But as they face challenges together, they could start to respect each other. Naruto might see the good in Kaguya that was buried under her past actions, and Kaguya could come to admire Naruto's tenacity and his strong sense of justice.
I like Naruto in these fanfics because he always stays true to his beliefs. He is constantly trying to bring Sasuke back to the village and is willing to fight for their friendship.
One of the best moments is when they have a rematch that showcases their growth. Naruto has become stronger with his new jutsu, and Sasuke has further mastered his Sharingan powers. The intense battle of ideologies during the fight is captivating.
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.
Sakura could also be included. She is a strong and independent character. Her medical skills would be useful in the harem, and her relationship with Naruto, which has evolved over time, could add an interesting dynamic to the group.