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In the fanfic, Naruto could potentially have some hidden power or connection that he uses to his advantage. For example, he might discover a long - lost prophecy that says the Uchiha are crucial for the future of the village. He then uses this knowledge to persuade everyone that the Uchiha should be spared. He might also enlist the help of his friends and allies, like Sasuke, to show a united front against the idea of the massacre.
She could survive by being away from the village during the massacre. When she returns, she is shocked. She decides to investigate the real cause of the massacre. Along the way, she discovers some dark secrets about her clan and the village. This knowledge gives her a new purpose, and she uses her Uchiha powers to bring the truth to light.
One way is to make the Otsutsuki OC a hidden observer during the Uchiha massacre. They could be there to study the Sharingan or the power dynamics within the Uchiha clan. For example, they might be interested in how the Uchiha's emotions, like hatred, are related to the power of their eyes. Another way is to have the OC be a factor that somehow influences Itachi's decision. Maybe they offer him a different option or some knowledge that makes him rethink his actions, but in the end, the massacre still occurs due to the complex web of political and clan - related reasons in the Naruto universe.
The Otsutsuki OC might be an unexpected bystander during the Uchiha Massacre. For example, they could have been on a different mission in Konoha when the massacre started. They might then decide to get involved, either to save some Uchihas out of a sense of justice or because they see potential in the Uchiha bloodline for their own purposes. So, they end up interfering with Itachi's plan and creating a whole new set of consequences for the story.
Imagine a ninja from another land who met Sasuke during a battle. She was a strong and independent fighter. After the battle, she was intrigued by Sasuke's skills and his complex personality. She started to seek him out, and they had many encounters. At first, Sasuke was dismissive, but her persistence and the unique bond they formed over time led to love. Their relationship was not easy, with Sasuke's past always looming, but their love prevailed in the end.
In this fanfic, perhaps they finally have a chance to rebuild their relationship. Sakura might use this post - war time to really understand Sasuke on a deeper level. They could start a family and Sasuke could finally let go of his past grudges and traumas, and focus on building a future with Sakura.
One possible plotline could be Sasuke's reintegration into the village. Sakura could play a big part in helping him adjust. They might face some opposition from villagers who still don't trust Sasuke completely. Another plotline could be their journey to find missing - nin or remnants of the enemy forces. During this, their relationship could develop as they rely on each other for support.
Their relationship could become more of a partnership. After the war, they both understand the importance of peace. So, Sasuke and Naruto might work together on various projects for the betterment of the ninja world. For example, they could start joint training programs for young ninjas from different villages.
Sasuke could travel the world in this fanfiction. He has seen so much destruction during the war, and now he might want to explore the beauty of the world. Along the way, he could meet new people, learn new jutsus from different regions, and perhaps even have some self - discovery. He might finally come to terms with his past actions and find a new purpose in life that is not just about revenge or power.