One possible new power could be the power to absorb and use any chakra, regardless of its origin. This would make him extremely powerful as he could draw from the chakra of his enemies or even from natural sources like the sun or the earth. He could also gain the power of telepathy on a large scale, being able to communicate with anyone in the world or even across different dimensions. Additionally, he might obtain the power of instant teleportation to any place he desires, which would give him a huge advantage in battles and travels.
If Naruto gets the Sharingan in this fanfiction, he might unlock the power to use some of the Uchiha - specific jutsu. For example, he could potentially use the Fire Style: Great Fireball Jutsu, which is a common Uchiha technique. Also, the Sharingan has different levels of evolution like the Mangekyo Sharingan. If Naruto were to reach that stage, he could gain even more powerful abilities, such as the ability to use Susanoo, which would make him an extremely powerful force in combat.
Well, in some fanfics, Naruto's death could be like a sacrifice that unlocks some hidden or ancient power. Maybe his death releases a special chakra that was locked within him, and this chakra then transforms into new, more powerful abilities. It could also be that his death is part of a prophecy, and upon his death, a deity or some other powerful entity grants him powers as a reward for his selfless act of sacrificing himself.
They could be trapped in a genjutsu world where they have to rely on each other to break free. In this world, their past differences don't matter as much, and they have to work together. Naruto uses his determination, Sakura her knowledge, and Sasuke his skills. Through this shared experience, they start to understand and get along with each other.
If Naruto and Sasuke had a Potara fusion in fanfiction, their powers would be a blend of their individual strengths. Naruto's ability to use the Nine - Tails' chakra would combine with Sasuke's Sharingan and Rinnegan powers. They might gain the ability to teleport long distances instantly, similar to how Sasuke can with his Rinnegan. Also, their combined combat skills would make them nearly unbeatable in battle, as they could switch between Naruto's close - range, brute - force attacks and Sasuke's more precise, long - range jutsu with ease.
Naruto would adapt by being his usual enthusiastic self. He would be all over the place, asking questions, and getting into adventures. He might use his ninja agility to his advantage in things like Quidditch, even if he doesn't fully understand the game at first. Sasuke would be more cautious. He would study the magic system intently, comparing it to his ninja knowledge. He might have a hard time adjusting to the more laid - back atmosphere at Hogwarts compared to the intense ninja training environment he's used to. But as he starts to master some magic, he would gain confidence and start to feel more at home.
Some fanfictions have Naruto getting super powers as a result of a divine intervention. Maybe the gods or goddesses of the Naruto universe see his great potential and decide to give him additional powers to help him in his quest to bring peace. This can lead to all sorts of interesting plot developments, like him having to prove himself worthy of these powers to the divine beings or facing the envy of other ninjas who don't have such divine blessings.
One way could be through a kekkei genkai transfer jutsu. If a powerful ninja, perhaps an old hermit with knowledge of ancient jutsus, decides to transfer Sasuke's Sharingan to Naruto for the greater good of the village. This jutsu might be risky but in the world of fanfiction, anything is possible.
Another theme is self - discovery. As Sasuke tries to get Naruto, he also discovers more about himself. He realizes his own feelings and how Naruto has influenced his growth. In some fanfics, this is shown through Sasuke's internal monologues as he reflects on his relationship with Naruto.
In some fanfictions, Naruto's determination helps break the ice between Sasuke and Sakura. Naruto's unwavering belief in their friendship encourages Sasuke to open up more, and Sakura, with her growth in medical ninjutsu and her own strength, becomes more confident around them. They start to have more friendly banter and support each other on missions, much like a real team should.