Naruto would probably become more disciplined. His impulsive nature might be tempered by Mifune's strict training regime.
His understanding of different cultures would expand. Since Mifune has a different background from the Leaf Village, Naruto would be exposed to new ways of life and values. This would make him more well - rounded as a character. He might also gain more respect for traditional forms of combat and become more versatile in battle, being able to switch between his regular ninja moves and the sword - based techniques he learned from Mifune.
In this fanfiction, Naruto might learn unique sword skills from Mifune. Mifune is known for his swordsmanship, so Naruto could gain a new combat style. Maybe he'd combine his existing ninja techniques with the precision and discipline of Mifune's sword fighting.
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.
Naruto would likely become more patient. Kurenai's training methods might force him to slow down and think more carefully, which is different from his usual impulsive self. This could lead to him making better decisions in battles.
His understanding of the Uchiha and the darker side of the ninja world would deepen. Itachi would share his experiences, and Naruto would gain a more nuanced view. This might make him more empathetic towards enemies. Also, his combat skills would diversify. He could incorporate Itachi - like precision and speed into his fighting style, becoming a more well - rounded ninja.
Naruto's physical abilities would obviously improve. But more than that, his spiritual side could be enhanced. The dragon might teach him about the balance between power and self - control. This could lead to Naruto having a more refined chakra control and a deeper understanding of the nature of power. As a result, he would not only be stronger in combat but also a wiser leader and friend in the story.