Naruto's powers would evolve in a very different way. Aizen's training might focus on the psychological aspect of combat. So, Naruto's chakra control could be enhanced in a way that allows him to project his presence in a more intimidating way, similar to how Aizen can make others feel his overwhelming power. His ninjutsu could also be modified to have hidden elements, like a Rasengan that has a secondary effect that only activates when the opponent least expects it, just as Aizen has multiple layers of deception in his attacks.
Well, Naruto might become extremely powerful in terms of his mental manipulation skills. Aizen is known for his cunning and ability to deceive. Naruto could learn new ways to outwit his opponents. He might also gain some unique combat techniques that are more psychological in nature, rather than just relying on his physical strength and ninjutsu.
They might have a mentor - student relationship. Aizen, with his vast knowledge and power, would be in the position of a mentor, guiding Naruto. Naruto, being eager to learn and grow stronger, would be the student. However, there could be some tension as Naruto has his own sense of justice which might conflict with Aizen's more self - serving motives at times.
His powers might become more refined. For instance, his control over water could be enhanced in terms of precision. Instead of just creating large waves, he could manipulate water at a microscopic level, like using it to disarm an enemy by getting into the mechanisms of their weapons. Athena's training could also give him the ability to combine his water powers with strategic thinking. So he could use water to create diversions or traps in a more intelligent way.
His chakra control might improve in a different way. Sesshomaru's precise and refined combat style could force Naruto to have better control over his chakra. For example, he might learn to use his chakra more sparingly like Sesshomaru uses his demonic energy.
His water - related powers could become more refined. Shiva has a connection to water in some Hindu myths, like his role in the Ganges river story. So, Percy might be able to control water in more complex ways, such as creating intricate water sculptures that can also be used as weapons. His ability to manipulate water temperature could also improve, allowing him to freeze water instantly or make it boil on a large scale.
As an apprentice to Deathstroke, Naruto's powers would evolve in several ways. His physical strength, which is already significant, could be increased through Deathstroke's intense training regimens. His chakra control might improve to the point where he can perform more complex and powerful jutsu with less effort. Also, Naruto might develop new techniques that combine his ninja abilities with Deathstroke's combat expertise. For instance, he could learn to create clones that can mimic Deathstroke's fighting style, allowing him to confuse and overpower his enemies. Moreover, his ability to adapt to different combat situations, which is a strength of his, would be further honed as he learns from Deathstroke's vast experience in various battles.
In this fanfiction, Naruto's power development could also be related to his perception of the world. Aizen's own view of power and the world is very different from what Naruto has been exposed to. Through their interactions, Naruto might start to see things from a different angle. This change in perspective could lead to a growth in his power as he discovers new ways to use his abilities. For instance, he could start to understand the weaknesses in his opponents more clearly and use his powers in a more targeted and effective manner.
Naruto's control over the Nine - Tails' chakra might be different. Since Killer Bee has experience with his own Tailed Beast, he could teach Naruto some new ways to communicate and cooperate with the Nine - Tails. This could lead to Naruto being able to access more of the Nine - Tails' power without losing control as easily as in the original story.
Naruto's character would likely become more reserved and stealthy. He'd be used to operating in the shadows, which is a big change from his normally boisterous self. His sense of justice might also be refined, as the ANBU has a different view on protecting the village.
Naruto might become more calculating. Urahara is a very strategic person, and under his training, Naruto could start thinking more before acting. For example, instead of just rushing into a fight, he'd analyze the situation first.