His character could develop in a very complex way. At first, he'd probably be confused and scared about the curse. But as time passes, he might use his immortality for good in a more extreme way. For example, he could take on the most dangerous missions without fear of death. However, the constant cycle of seeing people he loves die would also harden him. He might become more calculating and less impulsive, as he realizes the long - term consequences of his actions. He could also gain a deeper understanding of life and death, and maybe try to find a way to break the curse not just for himself, but for others who might be suffering from similar fates.
Percy would probably develop a greater sense of patience. Since he has all the time in the world, he could learn to wait for the right moment to act. This new - found patience could help him in his adventures and in his attempts to either break the curse or come to terms with his immortality. He might also study various things over the long years, becoming more knowledgeable and wise, which would also shape his character.
In such a fanfiction, Naruto might experience extreme loneliness. He would watch his friends and loved ones die while he remains alive. He could also be hunted or studied because of his immortality, constantly on the run from those who want to use his unique condition for their own gains.
Naruto's character would likely become more stoic. Vergil is known for his calm and collected demeanor, so Naruto might start to suppress his more exuberant emotions. He could become more calculating in battles, thinking several steps ahead like Vergil does when facing his enemies.
Naruto might become more serious. Deadshot is a very serious and focused character. So Naruto could lose some of his goofy and carefree nature and become more calculating in his actions.
Naruto might become more cautious. Dealing with the Daleks, who are extremely dangerous and unpredictable, would force him to think before acting. His normal brashness might be toned down a bit.
Naruto's character would likely become more calm and introspective. He'd focus more on inner peace rather than external battles.
His character might be more hardened. Growing up with Yahiko, he'd be exposed to the harsher side of the ninja world earlier. So he'd be less likely to trust blindly.
Naruto's character would likely become more calculating. He'd still have his core values of friendship and protecting his village, but he'd approach things with more cunning. For example, in battles, he might study his opponents' weaknesses more carefully before attacking. His social skills could also change. He might be more selective about who he trusts, using his Slytherin side to analyze people's motives.
Naruto's character would likely become more reserved at first. Konan's calm and collected nature might rub off on him. But he'd still keep his core of determination. He'd probably learn to be more strategic in combat, taking after Konan's planning skills. His view on the world might also change as he grows up in the Hidden Rain Village instead of Konoha.
In a fanfiction where Naruto is in the Akatsuki, his character would grow in terms of understanding different perspectives. He'd interact with characters who have very different backgrounds and motives from his friends in Konoha. His sense of loyalty would be tested as he'd be in a group that is generally considered the enemy. This could lead to him becoming more independent in his decision - making, rather than relying on the approval of his village. He might also become more calculating, as the Akatsuki often have to plan their moves carefully to avoid detection and achieve their goals.