If Naruto were to become the Avatar in fanfiction, his character would experience a significant transformation. His already strong sense of justice would expand to a global scale. He would no longer be just a shinobi of Konoha but a protector of an entire new world. His naivete might be tempered as he realizes the complex politics and power dynamics of the Avatar nations. His relationships would also change as he meets new people with different abilities and beliefs. He would have to adapt his ninja values to fit the Avatar's role, and this could lead to some internal conflicts as he tries to balance his old self with his new responsibilities.
Naruto would likely become more in tune with nature. As the Avatar, he'd have a closer connection to the elements. He might also be more diplomatic as he'd have to deal with different cultures in the Avatar world, which is different from just the ninja villages he knew.
He'd become more responsible for the whole world perhaps. Since the Avatar has to keep balance everywhere.
Naruto's character would likely become more patient. Dealing with Pokemon, which are different from his usual ninja foes, would require a different approach. He would have to understand their behaviors and needs, which would make him more patient and empathetic. Also, his leadership skills from the Naruto series would be enhanced as he might lead groups of Pokemon trainers in this fanfiction world.
Naruto's character would gain a new sense of responsibility. As a Green Lantern, he'd have to abide by the Corps' rules and uphold justice on a much larger scale. This might make him more serious at times, but his core of being a fun - loving and determined person would still remain. He'd also learn to work in a team with other Green Lanterns, which could be different from his experience with his ninja teams as they come from diverse backgrounds.
He'd become more cynical. Naruto is known for his positive outlook, but as a gangster, he'd see the world in a darker light. His trust in others would be severely diminished.
He could become less impulsive. Seeing Himawari's more calculated and careful approach to things, Naruto might learn from her. He may start to think things through more before acting, just like he admires in Himawari. Also, he would be more of a cheerleader for her, boosting her confidence which in turn would change his own character to be more of an encourager in general.
His view of the world might change. Raiden is often associated with protecting a larger realm, while Naruto has mainly focused on his village. As a Raiden fan, Naruto could start to think more about the broader world and his role in it, perhaps taking on more responsibilities outside of Konoha and developing a more global perspective.
Well, Naruto's personality would have an interesting transformation. He would likely become more of a risk - taker. The pirate world is full of uncertainties and dangers, and Naruto would embrace this. He might become more laid - back in some ways, enjoying the simple pleasures of life at sea like drinking grog (if they have something similar in this fanfiction world) and singing sea shanties. But at the same time, his competitive nature would still be there. He'd want to prove himself as a great pirate, perhaps competing with other well - known pirates. His naivete might also change a bit. While he was often naive in the ninja world, the harshness of the pirate life would make him more street - smart, yet still retain his positive outlook on life.
His relationship with Kurama might become more complex. Since he's now also a kitsune - like being. They could either become more competitive or find a new way to cooperate. With his friends, some might be in awe of his new form, while others might be a bit scared at first. But Naruto's kind heart would eventually make them all accept him as before.
Well, his journey would be completely different. Instead of following the traditional ninja path, he'd be on a journey to understand and master his new naga abilities. His goals might shift from protecting the village in the normal way to perhaps protecting a new community of naga or finding a way to co - exist between humans and nagas.
If Naruto becomes a nukenin, his relationship with the village elders would be completely severed. They would see him as a threat, and he would see them as unjust. With his peers, some might side with him, believing in his innocence. Others would follow the village's orders out of loyalty. His bond with the Nine - Tails would also change. The Nine - Tails might offer more support, seeing Naruto as an outcast like itself.
His relationship with Sasuke would be greatly affected. Sasuke, who has his own experiences with the idea of killing, might see Naruto in a new light. They could either become rivals again or Sasuke might try to 'save' Naruto from his new dark path. With Sakura, she would be horrified. She's always seen Naruto as a positive force, and this change would make her question everything. She might even try to use her medical skills to 'cure' Naruto of his new - found killer tendencies.