In this fanfiction scenario, Naruto's personality would experience a complex transformation. On one hand, he could inherit the Nine - tails' fierce independence. He might be less likely to rely on others in battle and more confident in his own abilities. On the other hand, he could also develop a more animalistic side. His reactions could be more instinct - based rather than thought - out. But at the same time, Naruto has a strong will of his own. So he'd probably be in a constant battle within himself to balance the Nine - tails' influence with his own values, which could lead to a more nuanced and unpredictable personality.
When Naruto wakes up as the Nine - tails in fanfiction, his personality might shift towards being more territorial. Since the Nine - tails has a primal sense of protecting its space, Naruto could start to view Konoha and its surroundings in a more possessive way. He might also become more reclusive, as he tries to come to terms with this new identity. However, he'd still likely retain some of his core Naruto - ness, like his loyalty to friends and his desire for ramen.
His personality could become more aggressive. The Nine - tails' instincts might seep into Naruto, making him quicker to anger. For example, he might not tolerate insults or threats to his village as passively as before.
He may become more aggressive. The power of the nine - tails can influence his normal calm and determined self, making him more likely to act on impulse and attack first without thinking too much about the consequences.
When Naruto becomes the Nine - Tails in fanfiction, his life is completely transformed. Socially, he might be isolated at first because others are intimidated by his new form. Emotionally, he has to come to terms with being a part - fox, part - human entity. He might have new memories or instincts that he has to learn to control. Physically, he has the power to destroy or protect on a massive scale. His daily life would be different as he has to adapt to his new body and powers, and he would have to find a new balance in his relationships with Sasuke, Sakura, and the rest of the village.
Naruto's relationship with his friends undergoes significant changes. His closest friends like Kakashi would be on high alert. Kakashi would constantly be watching Naruto to make sure he doesn't lose control. With his peers, some might start to distance themselves, fearing the unpredictable nature of the Nine Tails' power. However, true friends like Rock Lee would see it as an opportunity for Naruto to grow stronger. Lee might encourage Naruto to master the Nine Tails' power and use it for good. Naruto's relationship with his friends becomes a complex web of trust, fear, and support as he deals with the Nine Tails' possession.
In such a fanfiction scenario, Naruto might have an immediate understanding of the Nine - tails' power. He could potentially use the Nine - tails' chakra more instinctively and without the need for long - drawn - out negotiations. For example, his combat skills might be enhanced to a new level, being able to perform more powerful jutsu with ease. Also, his relationship with other characters could change. His friends might be both in awe and a bit scared of this new form of Naruto, leading to some interesting dynamics in their interactions.
At first, Naruto might see the Nine - Tails as just a source of power, something that makes him strong. But as he grows, he starts to see it as a part of himself, an entity with its own feelings and history.
Naruto's personality might show a more serious side. Wearing a suit could make him feel more responsible, like he has to represent the Hidden Leaf in a proper way. So he'd be less likely to crack jokes and more focused on the task at hand.
His personality might become more aggressive. The nine - tailed fox's instincts could seep into Naruto, making him more likely to attack without hesitation. He could also become more solitary as the power might be overwhelming and he doesn't want to accidentally harm his friends.
Naruto might become more calculating. Since Mewtwo is very intelligent and has powerful psychic abilities, Naruto would have to use his mind more. He would think before acting, unlike his impulsive self in the original series. This change could make him a better strategist in battles, but it could also lead to misunderstandings with his friends who are used to his more straightforward and impulsive nature.
Naruto's personality could shift towards being more reserved. As a Shinigami, he has to deal with the weight of handling souls and the concept of death. This could make him think twice before acting impulsively like he used to. He may also develop a more empathetic side towards those who are about to die or have lost loved ones, as he now has a closer connection to the afterlife.
His temper might be more volatile. The Kyuubi's influence could make him quicker to anger, especially when someone threatens his friends or the village. However, he also has better control over his emotions in other cases as he has to manage the power of the Kyuubi. He can't let his emotions run wild all the time. He might be more withdrawn in some aspects, spending time to understand and control the new power within him, rather than being as outgoing as he was before.