If Naruto has Itachi's disease in a fanfic, his personality could change in several ways. He might become more withdrawn as he doesn't want others to see him in a weakened state. However, he could also develop a deeper sense of empathy for Itachi, understanding the pain and sacrifice Itachi went through because of the disease. This could lead to a more mature and introspective Naruto, who is still determined but in a more quiet and reserved way.
Naruto's normally upbeat and energetic personality might become more subdued. He'd have to face the reality of his own mortality, which could make him more cautious and less impulsive.
Naruto's personality would likely experience a significant shift. He would no longer be the carefree ninja we know. With the disease, he would be forced to grow up quickly. His boisterousness might be replaced by a solemn determination. He would start to value his time more and might become more selective about the battles he fights. His once - unwavering confidence could be shaken, but he would also learn to rely on his inner strength in a different way. He might become more of a thinker, carefully considering the consequences of his actions, as he knows his time and energy are limited.
Naruto's personality could become more brooding. Having the power of the Death Note might make him more aware of the darker side of power. He might not be as open and friendly as he usually is, since he has this secret and rather sinister tool at his disposal.
One possible plot could be Naruto struggling to come to terms with having the same disease as Itachi. He might have to deal with the physical limitations and pain, while also trying to keep it a secret from his friends. This could lead to some internal conflict as he doesn't want to worry them, but also needs support.
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.
Naruto might become more confident, bordering on cocky at times. The Super Saiyan 4 transformation comes with a lot of power, and with that power, he could start to believe he's invincible. But deep down, his core values of protecting his friends and the village would still remain. He might also become a bit more impatient, as the power coursing through him could make him eager to jump into battles quickly.
His relationship with Sasuke would become extremely complex. Sasuke might see Naruto as a reminder of Itachi, which could stir up a mix of emotions like anger, envy, and also a strange sense of kinship. Naruto, on the other hand, might try to use Itachi's power to understand Sasuke better, but this could be misinterpreted by Sasuke as Naruto trying to take on the role of Itachi in his life. With his friends like Sakura and Kakashi, they might be initially wary of Naruto's new power. Sakura might worry that Naruto is losing himself to Itachi's power, while Kakashi would be more cautious and observant, trying to guide Naruto to use the power in a positive way.
Naruto's personality might not change drastically at first. He would still be as determined and head - strong as before. However, as a girl, he might become more aware of how others perceive him. He could become more empathetic towards female characters in the ninja world, understanding their struggles better. Also, he might be a bit more cautious in some situations, especially when dealing with male characters who might act differently towards him now.
Well, with Minato's personality, Naruto would probably be more reserved in showing his emotions. He wouldn't be as boisterous or loud as he usually is. This could change his relationships too. For example, his interactions with Sasuke might be less about yelling out his feelings and more about subtly trying to understand and help him. Also, his leadership style could be more like Minato's, inspiring trust in his comrades through his composed and intelligent demeanor.
If Naruto had Gaara's personality, the story would be very different. Naruto is usually outgoing and boisterous, while Gaara is more reserved and initially cold. With Gaara's personality, Naruto might not be as quick to make friends. He'd be more guarded and less likely to trust others easily. This could change his relationships with characters like Sasuke and Sakura. His interactions with the villagers would also be different. Instead of trying to gain their approval through big shows of strength and determination, he might keep more to himself, which could slow down his journey to becoming Hokage.
The story would change drastically. Naruto's presence in Itachi's role would mean a different set of values driving the actions. Naruto values friendship and believes in the good in people. So, in dealing with the Akatsuki, he might try to convert some of them rather than just eliminate them.
His relationship with Sasuke would be very different. Instead of being a peer trying to bring Sasuke back, he'd be more like an older figure. He might be someone Sasuke looks up to or even fears because of his power and knowledge at that age. Naruto would also have a different relationship with Kakashi. He'd probably be more of an equal to Kakashi in terms of combat ability and strategic thinking.