Well, in fanfiction, the Naruto and Kyuubi fusion could lead to a change in how the ninja world views Naruto. He would be seen as an even greater threat or an even more powerful ally. For example, other villages might be more hesitant to engage in conflict with him. Also, his relationship with his friends could be affected. They might be in awe of his new power but also a bit worried about the Kyuubi's influence on him. And on a physical level, his appearance might change, perhaps taking on some of the Kyuubi's features, like his eyes or his hair color getting a more reddish tint.
The fusion might result in Naruto having a deeper understanding of the Kyuubi's history and the secrets it holds. Since the Kyuubi has been around for a long time and has seen many things in the ninja world, Naruto could gain this knowledge. This could lead him to make different decisions regarding the future of the ninja world. He might also be able to access the Kyuubi's memories of past battles and learn from them, improving his combat strategies. Additionally, the fusion could potentially disrupt the balance of power in the ninja world, causing other powerful entities to either seek an alliance with Naruto or try to eliminate him out of fear.
One possible consequence is that the power balance in the ninja world is completely disrupted. With the Kyuubi's massive chakra and power running free, smaller villages might be constantly in fear of being attacked. Konoha, in particular, would have to find new ways to defend itself without relying on the fact that the Kyuubi is sealed within one of its shinobi.
One consequence could be a huge power boost. Naruto would become extremely strong, which might change the power balance in the fanfiction world. Enemies would be more cautious of him, and allies might rely on him more. Another consequence could be the internal struggle. The Kyuubi has its own will, so Naruto might have to constantly fight to maintain control when it's summoned.
One possible consequence is that Naruto might lose control of his own actions. The Kyuubi is a powerful and often uncontrollable force. So, he could end up causing a great deal of destruction without meaning to. For example, he might attack his friends or allies in the heat of the moment as the Kyuubi's power overwhelms his own judgment.
One consequence could be that he becomes extremely powerful. His physical abilities like strength, speed, and endurance are enhanced. He can also use more powerful jutsus with the extra chakra boost from the Kyuubi.
In 'naruto and fem kyuubi fusion fanfiction', an interesting plot point could be the internal struggle within the fusion. Naruto has his own values and goals, while the fem Kyuubi has her own nature. The two might clash initially as they try to coexist within the fusion. This could lead to some character development for Naruto as he learns to accept and work with the fem Kyuubi's different perspective. Additionally, the fusion might attract the attention of old enemies or new threats that see this new form as a great danger or a powerful tool to be controlled.
In fanfiction, the fusion can completely transform Naruto's abilities. Firstly, his chakra control could reach a whole new level. With the Kyuubi's chakra, which is vast and powerful, he could perform long - range and large - scale attacks more easily. His ability to sense danger and opponents would also improve. The Kyuubi's instincts might add to Naruto's natural senses, making him more aware of his surroundings. Moreover, Naruto might gain the ability to transform into a more powerful form that combines his human features with some of the Kyuubi's characteristics, like having fox ears or a tail while still maintaining his humanoid shape, which would give him additional advantages in combat, such as better balance and agility.
One possible consequence could be a shift in the power dynamics in the Naruto universe. If Naruto frees the female Kyuubi, she might become an ally. This could change how battles are fought as she could bring her unique powers to help Naruto and his friends. For example, she might have different abilities compared to the regular Kyuubi, like more refined chakra control which she could teach Naruto.
In some fanfictions, when Naruto loses control of Kyuubi, other villages might see it as an opportunity to attack Konoha. They may think that with Naruto out of control, Konoha is in a weakened state. This could start a whole new arc of conflict where Konoha has to defend itself not only from Naruto's unleashed power but also from external threats.
In some fanfictions, the immediate consequence could be destruction. Buildings might be razed and many shinobi could be injured or killed. The village would be in chaos as they try to either contain Naruto or the Kyuubi's power. There could also be a shift in the power dynamics, with some seeing Naruto as a threat and others trying to find a way to calm him down and reseal the Kyuubi.
He would likely become extremely powerful. His combat abilities would be enhanced significantly as the Rinnegan gives access to powerful jutsus. He could also gain new insights into the nature of chakra and the world around him.