Often, Naruto in these fanfictions will have to face the consequences of his power hunger. He may lose the trust of his friends initially, which could then lead to a realization that power isn't everything. His development could then take a turn where he tries to regain what he has lost while still holding onto his new - found strength in a more balanced way.
His development can also involve a moral struggle. On one hand, the power he gains gives him a sense of security and the ability to protect. But on the other hand, the methods he uses to gain that power might be against his original values. This internal conflict can shape his character as he decides whether to continue down the power - hungry path or return to his more altruistic self.
Naruto would become more confident. Gojo's power is extremely strong, and having it would make Naruto feel like he could handle almost any situation. He'd also become more strategic as Gojo's power requires a different approach to combat compared to his normal ninja skills.
One example could be a fanfiction where Naruto becomes obsessed with power to the point of challenging all the great shinobi in the world without hesitation. He might seek out forbidden jutsus and train in isolation to gain more power, disregarding his friends and the village at first.
At first, Naruto might be overconfident with his reality - controlling power. He'd probably use it without thinking, like getting instant ramen whenever he wants. But as time goes on, he realizes the responsibility that comes with it. He starts to use it more carefully, for example, to heal the wounded or prevent natural disasters in the shinobi world.
Naruto may become more confident. With supreme military power, he no longer has to struggle as much as before. This new - found strength could make him more self - assured in his decisions and actions.
Naruto would likely become more confident. With such a powerful ability as the godlike Sharingan, he would know he has an edge in battles. He might also become more cautious, as he realizes the great responsibility that comes with such power. For example, he wouldn't want to accidentally harm his friends with a new, powerful genjutsu from the Sharingan.
He would likely become more responsible. Since he has such a powerful ability, he knows he has to use it for the good of the village. He may start to take on more leadership roles, as he can now analyze situations more thoroughly in the frozen time. He'll also become more empathetic as he can use the time - stopping to understand his friends' and enemies' situations better. For instance, he could stop time to study an enemy's past and find out what made them the way they are, and then try to help them instead of just fighting.
Orochimaru is a very likely character. He has always been shown to be extremely power - hungry in the original Naruto series. He's constantly seeking new ways to gain more power, whether it's through experimenting on others or trying to obtain the Sharingan. Another one could be Kabuto. He was influenced by Orochimaru and also had a strong desire for power. He tried to absorb all kinds of powers and knowledge to become stronger. And Madara Uchiha is also a candidate. His plan to create the Infinite Tsukuyomi was mainly driven by his thirst for power and his desire to reshape the world according to his own will.
His character might also become more empathetic. As he glares at Sirzechs' power, he could start to understand the responsibilities that come with great power. Through interactions with Sirzechs or observing how Sirzechs uses his power, Naruto might learn to be more understanding of others with great power and the choices they have to make. This could lead to a more well - rounded Naruto who not only has physical strength but also emotional intelligence.
His character might become more confident, almost to the point of being cocky. He would know that he can handle any situation, so he might take more risks.
If Naruto got Wolverine's power in fanfiction, his development would be really interesting. He'd have to learn to control the healing factor and not rely too much on it. His sense of self - worth might change as he realizes he has this new, extremely powerful ability. He might also become more of a loner in some ways, but still be part of the Konoha community. He could start to question his ninja way in the face of this new power, but ultimately find a way to incorporate it into his values.