Naruto might become more cautious. Guns are very different from ninja tools, and one wrong move could be fatal. So he'd have to think twice before acting impulsively, which is a big change from his usual head - first approach.
Naruto would likely gain a new sense of power and responsibility. The gun gives him an edge in combat, but he also has to be responsible for not misusing it. This could lead to a more mature Naruto. He would have to learn about the proper use of such a weapon in the context of the ninja world, which has its own rules and ethics. He might start to study more about different cultures and technologies where guns are common, trying to understand how to integrate this new element into his ninja way.
He could become more isolated. The gun is a foreign and dangerous object in the ninja world. Some in the village might fear or distrust him because of it. Naruto, who values friendship and being part of the village, would have to deal with this newfound alienation. He might start to question his place in the village and among his friends. His cheerful and optimistic nature could be dampened as he struggles with this new situation and the power the gun represents.
Naruto's character could change in several ways. Firstly, he might become more secretive as he tries to figure out what the gun is without causing panic. He's always been an open book, but this strange discovery might make him hold back some information. Secondly, he could become a bit more of a loner as he delves into understanding the gun on his own. He might feel that his friends won't understand this new aspect of his world. Also, his sense of right and wrong could be challenged. The gun's lethality is different from his normal weapons, and he'd have to decide how and when it's appropriate to use it, if at all, which would be a big shift in his character.
His relationship with his friends might change. Some of his friends who are more used to the 'old Percy' might be a bit shocked or even worried about his new weapon choice. On the other hand, he might attract new allies who are more into modern - day combat methods. Overall, his character would have to adapt to the new implications and responsibilities that come with using a gun.
His sense of justice could be tested. Using a gun might seem like an easier way to defeat enemies, but Naruto has always believed in fair fights. With a gun, he'd need to reevaluate his beliefs. He could either become more of a vigilante or strive to find a balance between the power of the gun and his ninja values.
Naruto would likely become more confident. With Hulk - strength, he'd be able to handle most physical threats easily. He might also become a bit more reckless at first, as he gets used to his new power. He could be quicker to jump into a fight without fully thinking it through, knowing he has the strength to handle it.
Naruto would become more introspective. The Mangekyou Sharingan often comes with a heavy burden and dark secrets. He'd have to deal with the new powers and the potential corruption they bring. For example, he might start to question his own motives more often.
His character would likely become more complex. Having a gun would give him an edge that he didn't have before, which could make him more confident or even a bit cocky at first. But he'd also have to deal with the moral implications of using such a deadly weapon. He's always been about protecting his friends and the village, but a gun is a very different kind of weapon compared to his ninja tools.
If Naruto had Sayian and Kriptonion DNA, his character would change significantly. The Sayian DNA would add a layer of cockiness to his personality. We see in the Dragon Ball series that Sayians can be a bit full of themselves when it comes to their power. Naruto might start to show off his new powers more. The Kriptonion DNA would give him a sense of justice on a larger scale. He would no longer just be focused on the ninja world's justice but would look at the broader picture of the universe. His relationships with his friends might also change as they have to adjust to this new, more powerful and different Naruto.
Naruto would become more powerful, and this might make him a bit more cautious. He's used to his regular ninja abilities, but the gura gura fruit's power is on a different level. He might be more hesitant in battles at first, not wanting to accidentally cause too much destruction with the fruit's earthquake - causing ability.
He might become more powerful. The Storm Release Bloodline could give him new offensive and defensive abilities, making him a more formidable opponent.
He would likely be more isolated at first. The Magu Magu Fruit powers are different from normal ninjutsu. His friends might not understand it fully, and he would need time to master it alone. This would make him more introspective, but as he gets better control, he would start to share his knowledge and use it for the good of the village. Also, his fighting style would change drastically. Instead of relying solely on his shadow clones and Rasengan, he would incorporate the heat - based attacks of the Magu Magu Fruit, making him a more versatile fighter.