The descendant would likely be in awe of Naruto at first. Since Naruto is a great hero in the Naruto universe, the descendant might look up to him and seek his guidance. With Sasuke, there could be initial mistrust as Sasuke is often cautious around new and powerful individuals. But over time, they could form an alliance to face common threats.
She would interact with Sasuke in an interesting way. Maybe she initially sees his thirst for revenge as a dangerous path similar to how kitsunes can be lured by dark desires. So she tries to steer him away from it.
Well, Naruto himself would be very curious about the Justice League. He would probably be excited to meet heroes with such different powers. He might try to show off his own skills a bit at first. As for the League, Superman would likely be intrigued by Naruto's chakra - based powers. He would want to understand how they work compared to his own superpowers.
The characters' interactions would be a blend of different cultures and power sets. Naruto's team might be amazed by the Death Scythes in Soul Eater. They could see them as super - powerful weapons compared to their kunai and shuriken. Meanwhile, the Soul Eater characters would be intrigued by Naruto's ability to summon toads. They might ask him to summon one for them to study. And when it comes to the Juubi, characters like Kid from Soul Eater, with his love for symmetry, might be especially interested in studying the Juubi's power structure, while Naruto would be more focused on how to defeat it.
Well, they could interact with the Naruto world by getting involved in the village politics. Since they are reborn as someone close to Sakura, they might have an influence on how the Hidden Leaf Village is run. For instance, they could suggest new medical policies based on their modern knowledge. Also, they could befriend other characters like Naruto and Sasuke, and through their interactions, they could introduce new ideas and technologies to the ninja world. This would not only change their relationships but also the overall dynamic of the Naruto world.
The Juubi could save Naruto by sharing its knowledge. In the fanfiction, the Juubi might be an ancient and wise being. It could communicate with Naruto on a spiritual level and give him insights or techniques that help him out of a tough situation. For instance, it could show Naruto a new way to use his existing jutsu more effectively, or it could reveal a secret about the enemy that Naruto is facing, allowing him to strategize better and ultimately be saved from defeat.
Naruto's Rasengan could be used in a similar way as some of the physical attacks in One Piece. For example, it could be as powerful as Luffy's Gear attacks. Also, his ability to jump great heights and distances might be on par with some of the Zoan Devil Fruit users' enhanced physical abilities.
He might develop a more refined sense of strategy. Since the Nidaime was known for his intelligence and strategic thinking, Naruto could inherit some of that. He would be more calculated in his battles and less likely to rush in headfirst all the time.
Maybe through some sort of ancient ritual. In the Naruto universe, there are often powerful and mysterious rituals. It could be that Naruto discovers an old scroll or is guided by a sage to perform a ritual that allows him to bond with the Juubi.
The story would change drastically. Naruto's identity as a descendant of Madara would immediately put him at odds with some in the village who still fear the Uchiha. His journey to become Hokage would be even more challenging as he has to prove that he's not going to follow in Madara's footsteps. Also, his training might take a different route. He could be taught some ancient Uchiha techniques by an unexpected mentor, perhaps an old Uchiha who has been in hiding.
He would be protective of the cat. Given his nature of always wanting to protect the weak, if any threats came towards the cat, Naruto would be the first to step in. He might also talk to the cat a lot, sharing his dreams and stories about his adventures, even if the cat couldn't understand his words.