His character could change in several ways. Firstly, he may become more ruthless in battle. Darkseid's training doesn't seem to have much room for mercy. Also, Naruto might start to question his own values. He has always been about protecting his friends and the village, but with Darkseid's influence, he could wonder if there are other ways to achieve peace, perhaps more authoritarian ways. And his appearance might also change to reflect his new, more godlike and dark - tinged power, which could further isolate him from his comrades.
Naruto might become more brooding. The dark training from Darkseid could make him less of the cheerful, optimistic Naruto we know. He may be more secretive about his new powers and training.
Naruto's character would experience a significant shift. His once unwavering belief in the power of friendship and the good in people could be shaken. Darkseid's training might introduce him to a world view where power is everything and the end justifies the means. He could become more solitary, as his new powers and the methods of obtaining them are not something his friends can easily understand or accept. He may also develop a sense of superiority, not in an arrogant way at first, but more in a 'I know better because I've seen different ways of power' kind of way. This could lead to conflicts with his old friends and mentors, as they try to bring back the old Naruto while he is trying to find his new identity in this world of godlike power and dark training.
Naruto's morality could be somewhat skewed. Orochimaru has a very different view on right and wrong compared to Naruto. So, Naruto might start to question some of his previous beliefs. For example, he might be more willing to use dangerous or forbidden jutsus if it means achieving his goals. He'd also probably be more distrustful of others, as Orochimaru always has ulterior motives. This would be a big change from the Naruto who was always so quick to trust and befriend people.
Naruto would probably have a more complex view of power. In the original, he was all about becoming stronger to protect his friends. But as a Darkseid clone, he might question the nature of power. Darkseid uses power for domination, and Naruto would have to struggle not to be influenced by that aspect while still using his new - found powers for good.
If trained by DIO, Naruto's character would likely change in several ways. Firstly, he might become more self - centered. DIO is all about self - preservation and power, and some of that could rub off on Naruto. However, he would still have his core values. His sense of justice might get distorted a bit as DIO's methods are often amoral. But on the positive side, he could become more confident and fearless in the face of stronger opponents, as DIO's training would surely toughen him up both physically and mentally.
Naruto's character would likely become more complex. On one hand, he would have the raw power and new skills from Tremor's training. But on the other hand, he might struggle with the more aggressive and perhaps morally ambiguous aspects of Tremor's fighting style. He might question his own values at times, but ultimately, he could emerge as a more well - rounded ninja. For example, he might initially be hesitant to use some of the more destructive techniques Tremor teaches him, but as he realizes the necessity in certain situations, he would grow in his understanding of the grey areas in combat and ninja life.
Naruto's character would develop a new sense of self - confidence. Having the Godlike Sharingan and being trained by Itachi would give him a feeling of being a part of something greater. He would no longer be just the 'loud - mouthed underdog' but a powerful ninja with unique abilities. However, he would also have to deal with the new expectations that come with this power. He might struggle with the idea of whether he is still the same Naruto or if the power has changed him too much. This internal conflict would be an important part of his character development as he tries to find a balance between his old self and the new, more powerful version of himself.
In this fanfiction, Naruto's character would experience a multi - faceted development. At first, he might be in awe of Hashirama and eager to learn everything. As he delves deeper into the training, he'd face self - doubt when he struggles to master certain techniques. However, with Hashirama's encouragement, he'd overcome these obstacles. His confidence would grow, not in the cocky way he had before, but in a more stable and reliable manner. His view of power would change. Instead of seeing it just as a means to protect his friends, he'd understand it as a tool to maintain the balance of the ninja world. His relationships with his peers would also evolve. He'd be more of a guiding figure, using his experiences with Hashirama to mentor others in the village.
Naruto would likely become more stealthy. Itachi is known for his stealth and if he trains Naruto, Naruto would pick up some of those skills. He might start to rely less on his brash and straightforward fighting style and incorporate more subtlety.
Naruto would likely become more serious. Madara's influence would probably make him less impulsive. For instance, he would think twice before charging into battle without a proper plan.
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.
The plot could involve Naruto learning Darkseid's powerful and dark techniques. Maybe he struggles with the morality of using such dark powers while also becoming extremely powerful. For example, he might use his newfound strength to protect Konoha in a way that scares his friends at first because of its intensity.