In this fanfiction, it could be that Muu sees Naruto's potential and decides to train him in stealth and strategy. Naruto, being more of a straightforward fighter, might initially struggle with Muu's complex strategies. But as the training progresses, he starts to understand the importance of thinking several steps ahead in battle and becomes a more well - rounded shinobi.
Well, perhaps Naruto could learn some unique and powerful jutsu from Muu. Maybe Muu has a special training method that focuses on Naruto's chakra control and helps him unlock new levels of power. For example, Muu might teach Naruto how to better utilize nature chakra in a different way compared to what he learned from Jiraiya.
One possible plot could be that Muu has some ancient knowledge about sealing techniques. He trains Naruto in these techniques, which Naruto then uses to improve his own Rasengan or create new powerful attacks. Also, Muu might have connections to some secret shinobi clans, and through his training, Naruto gets involved with these clans and discovers new allies and enemies.
Maybe Muu is a long - lost member of a powerful clan that has some special connection to Naruto's Uzumaki heritage. So he takes it upon himself to train Naruto to help him reach his full potential and also to preserve some ancient techniques or secrets related to their clans.
Well, it could be about a character who is a descendant of Muu having some sort of special powers that Naruto discovers. Maybe they team up to fight a new threat in the ninja world.
Well, it could be about Naruto being forced into a dark situation where he has to train for killing. Maybe he's been misled or there's a great threat that makes him think this is the only way. For example, he might be tricked by an enemy who disguises as a friend and convinces him that the only way to protect the village is to become a killer.
Well, in such a fanfiction, Naruto might learn unique skills from the summons. For example, he could learn stealth from a cat - like summon or brute strength tactics from a bear - like one.
In the 'naruto trained seriously fanfiction', Naruto could be training with his friends in a more serious way. They might form a special training group where they push each other to their limits. For example, they could be training to improve their teamwork and combination jutsus. Naruto might focus on his speed and strength training while also learning how to better coordinate with his friends' abilities, like Sasuke's Sharingan - based attacks and Sakura's medical and combat skills.
In this fanfiction, perhaps Naruto could learn some unique jutsu from Asuma. Asuma was known for his wind - style jutsu, so he might teach Naruto advanced wind - style techniques that Naruto could incorporate into his Rasengan, creating a more powerful attack.
In the fanfiction, Naruto could also develop new strategies for fighting. Pein is a strategic mastermind, and under his training, Naruto might learn how to better analyze his opponents, anticipate their moves, and come up with more effective battle plans. This could give him an edge in future battles against powerful enemies.
In this fanfiction scenario, Kurenai could also help Naruto with his emotional control. Naruto has a strong will but sometimes his emotions can get the better of him. Kurenai, with her calm and collected nature, could teach Naruto how to stay focused and in control during intense situations. For example, she could use her own experiences to show Naruto how to channel his emotions into strength rather than letting them cloud his judgment. This would not only improve his combat abilities but also his decision - making skills.
One possible plot could be that Shisui imparts his unique Sharingan - related skills to Naruto. For example, he might teach Naruto how to predict opponents' moves better, just like how the Sharingan can analyze the flow of chakra and movements. This would give Naruto an edge in battles, especially against strong opponents who rely on speed and deception.
In this fanfiction, perhaps Hiruzen realizes Naruto's potential much earlier and decides to train him privately. He might take Naruto on secret missions to build his experience and confidence. This would not only strengthen Naruto's skills but also their bond, which could have a huge impact on the village's future.