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.
In the fanfiction, Naruto could enter Kaguya's mind. He might discover her past traumas that led her to become so power - hungry and vengeful. By understanding her pain, Naruto could offer her forgiveness and a new path. He could show her a vision of a future where she is part of a united world, not feared or hated, but respected and loved if she changes her ways. This could be a powerful incentive for Kaguya to change.
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.
One interesting scenario could be a fight in an alternate dimension where the rules of chakra are different. This would force both Naruto and Sasuke to adapt new strategies. Another could be a battle where they are forced to team up against a common enemy first before their duel, which would add a complex layer of emotions and dynamics.
One scenario could be that Naruto uses his shadow clone jutsu to overwhelm Superman. The clones could attack from all directions, and while Superman is busy dealing with them, Naruto could prepare a powerful Rasengan. Another scenario might be Superman using his heat vision to try and stop Naruto's summons, like the giant toads. But Naruto could use his speed and agility to dodge and counter - attack.
One scenario could be that Naruto underestimates Kiba at first. Kiba and Akamaru launch a surprise attack using their Fang over Fang technique. Naruto is caught off guard but quickly recovers and creates a wall of shadow clones. Another scenario is that Kiba challenges Naruto in a more strategic battle, like in a forest where he can use the environment to his advantage. Naruto, on the other hand, uses his Sage Mode to sense their movements and counterattacks with his Rasengan.
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.
One possible scenario could be a power imbalance. Maybe Sasuke discovers some new, extremely powerful jutsu that Naruto has no defense against. For example, a jutsu that can nullify Naruto's chakra or attack his spirit directly. Another possibility is a miscommunication or a breakdown in their relationship. If Sasuke believes Naruto has betrayed him in some way, his anger could lead him to kill Naruto. However, this goes against the core of their bond in the original series.
One possible scenario could be that they sacrifice themselves to save the village from an ultimate evil. They might combine their powers in a final, desperate move that exhausts them completely, leading to their deaths.
Another scenario could be that they are poisoned by a new, undetectable toxin. As they gradually weaken, they try to find a cure but run out of time. Their deaths would be a great loss, and it could lead to major changes in the political and social structure of the ninja world as everyone copes with their passing.
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.