Naruto would probably become more confident in his abilities. Since he has the Kyuubi inside him, with proper training from it, he could be less impulsive and more strategic in using his power. Sasuke might become more empathetic. He'd understand Naruto's connection to the Kyuubi better and might see that there are other ways to gain power than just through revenge. Overall, their relationship could also deepen as they share this unique training experience.
For Naruto, being trained by Kyuubi in fanfiction could make him more in tune with his own emotions. He'd be able to use the Kyuubi's power not just for fighting, but also for self - discovery. His character could grow to be more mature, as he learns from the ancient and powerful Kyuubi. Sasuke, in this case, might change his view on power. Instead of seeking it through dark means, he could see the positive side of the Kyuubi's power and start to value life more. This could lead to a more balanced and complex character development for both of them.
Naruto would grow in his understanding of the ninja way. He's always been a bit of a maverick, but Hagoromo's training could give him a more traditional yet enhanced view. His bonds with others would become even stronger, and he would be more of a leader in the ninja world. Sasuke would start to let go of some of his past grudges. Hagoromo's wisdom could show him that holding onto so much hate is not the way forward. He would become more focused on protecting the ninja world rather than just seeking power for his own reasons. Their characters would evolve to be more rounded and in line with the greater good of the ninja world.
In such a fanfiction scenario, they would likely become extremely powerful. Naruto already has a connection with Kyuubi, so the training might focus on better harnessing that power. Sasuke, on the other hand, could gain new insights into chakra control and power - up techniques. They might also develop new jutsu combinations that are unique to this training. Overall, it could lead to a significant shift in the power balance in the Naruto universe.
In this fanfiction, Naruto's character experiences significant growth. His training with the female Kyuubi forces him to face his fears head - on. He has to confront the power of the Kyuubi and learn to control it, which makes him braver. He also becomes more patient. The training is not easy, and he has to endure setbacks and difficulties. This patience extends to his interactions with others. He is more willing to listen and understand different perspectives. Moreover, Naruto's sense of justice becomes more refined. He uses his new power not just to prove himself but to protect the weak and uphold what is right in the ninja world.
Naruto would probably become more empathetic. Since the fem Kyuubi has her own unique perspective, Naruto would be exposed to different ways of thinking. This could make him better at understanding others' feelings.
His view of the world would expand. Naruto, who was mainly focused on the ninja world, would now be exposed to the magical world through Merlin. This would make him more open - minded and understanding of different cultures and powers. He may also start to use his newfound knowledge to try and bring peace not just between ninja villages, but also between the ninja world and the magical realm Merlin comes from.
Naruto's character would develop in several ways. He'd become more patient as Hagoromo's teachings are likely profound and require time to absorb. His sense of responsibility would grow even more. Since Hagoromo has a deep connection to the history of the ninja world, Naruto would also gain a greater respect for the past and traditions. This new - found knowledge would make him a more well - rounded leader, not just a powerful fighter.
Naruto's character development would be multi - faceted. He would become more strategic in his approach to combat. Yamamoto's battle experience and knowledge would be passed on to Naruto, making him a more well - rounded fighter. Emotionally, he might become more reserved in some ways. Since Yamamoto is not as outwardly emotional as Naruto, Naruto would learn to control his emotions better during battle. However, he would still retain his core values of protecting his friends and the village. This new training would just enhance his ability to do so more effectively.
His understanding of the ninja world would expand. He might become more cautious and calculating in battles, as Kaguya's training could expose him to different strategies. Also, he could develop a more solemn side to his personality, considering Kaguya's own complex nature and the heavy knowledge she might share.
His understanding of the ninja world might deepen. Yugao has different experiences compared to his other mentors. So, Naruto could learn about different aspects of the ninja life, like the sacrifices ANBU members make. This would make him more mature in his thinking.
Naruto would become more confident. With Kurama's training, he'd know he has more power and skills at his disposal, so he'd face challenges with less hesitation.