Naruto may become more confident. Having the Kyuubi body gives him a new level of power, which could boost his self - assurance in battles and in his interactions with others.
Another possible plot is that Naruto struggles with the Kyuubi's instincts within his new body. He has to balance his own values and will with the primal urges of the Kyuubi. This internal conflict could be really fascinating as he tries to stay true to himself while harnessing the power of the Kyuubi body, and it could also lead to some character development where he becomes even more self - aware and in control of his emotions and powers.
He might become more aggressive. Because he looks like Kyuubi, he may start to act more like the powerful and sometimes wild - tempered fox. His usual friendly and sometimes goofy nature could be overshadowed by a more serious and intimidating demeanor.
His character could become more mature. Since Kyuubi has a lot of knowledge and experience, Naruto would learn from it. He would be less impulsive and think more before acting. Their friendship would also make Naruto more understanding of the darker aspects of life, as Kyuubi has seen a lot of pain and destruction. This new understanding would shape him into a more well - rounded and wiser ninja.
Naruto's character would change in multiple aspects. First, he would have to adapt to the new abilities of the Rinnegan. This would require him to study and train more, making him more focused and perhaps a bit less impulsive. Second, the power of the Rinnegan might give him a different perspective on the ninja world. He might start to see the power struggles and politics in a new light. Third, his relationships with his friends, especially Sasuke, would be different. Since he now has a part of Sasuke (in the form of the Rinnegan), their bond could become even more complex and deep. And finally, he might face new challenges in terms of his identity, as he is now not just the Nine - Tails Jinchuriki Naruto, but also the wielder of the Rinnegan.
Kyuubi's comfort can make Naruto more confident. Knowing that he has Kyuubi's support, he may take on more difficult missions without hesitation. For instance, if he's facing a powerful enemy, he'll remember Kyuubi's words of encouragement and stand his ground firmly.
No. In the Naruto series, Naruto is the host of the Kyuubi, not its slave. Fanfics might deviate from the original concept, but in the official story, Naruto has a symbiotic relationship with the Kyuubi. He gains power from it and eventually befriends the Kyuubi spirit.
Naruto becomes more confident. With the Kyuubi soul, he has a new source of power that makes him feel like he can take on bigger challenges. For instance, he might be more assertive in battles and negotiations.
Naruto's caring changes their relationship in a positive way. At first, the Kyuubi saw Naruto as just a vessel. But as Naruto shows care, the Kyuubi starts to see him as an equal. For instance, it might start to communicate more openly with Naruto, sharing its knowledge of the ninja world.
In this fanfiction, their relationship becomes more of a partnership. Instead of Naruto just using the Kyuubi's power, they work together as brothers. Naruto might start to understand the Kyuubi's feelings and motives better.
If Naruto is the son of Kyuubi in the fanfiction, his character development would be drastically different. He would have a different kind of self - discovery journey. His relationship with the villagers could be more hostile from the start. They might not just see him as the container of the Kyuubi but as the actual offspring of the beast they fear. This would force him to grow up faster, in a sense. He would have to prove himself not just as a ninja but as someone worthy of acceptance despite his 'parentage'. His training might also focus more on controlling his in - born Kyuubi - like traits rather than just taming the Kyuubi's power within him.