Naruto's character would likely become more refined. With the influence of fem Harry Potter, he might be more diplomatic. He could learn from her how to approach problems with a different mindset, not just brute force. For instance, he may start using his words more effectively before jumping into a fight.
She would likely start off very influenced by Grindelwald. Maybe she'd be a bit cold and calculating like him at first. But as she experiences more of the world, she'd become more empathetic. For instance, if she meets a group of oppressed wizards, she'd start to question Grindelwald's views.
Her character might start off a bit confused. Being in a new world as Naruto's sister, she has to adapt. She could develop a strong sense of loyalty to the Hidden Leaf village like Naruto. And as she grows, she might become more confident in using her magic in this new environment. Maybe she starts off being a bit shy about it but then realizes it can be a great asset.
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 would be more disciplined. Gai's strict training regime would make him more focused on his goals.
Naruto's character would likely be more distrustful of traditional ninja institutions. Since he's raised by a rogue, he might see the established ninja villages as corrupt or overly restrictive. He could be more rebellious and less likely to follow orders blindly.
Naruto might become more sensitive and perceptive. Since kunoichi often have a different way of looking at things compared to male ninjas, Naruto could pick up on those traits.
Naruto's view of family would be different if raised by Pakura. Since Pakura could be seen as a surrogate mother figure, he'd have a different understanding of maternal love. This would affect his relationships with others, especially female characters. He might be more respectful towards women from the start. His growth as a ninja would be more centered around Suna's way of life. For example, he'd be more involved in protecting Suna's trade routes and resources, which would shape his ninja skills and values in a way that's distinct from his Konoha - raised self.
Naruto would probably be more in touch with nature. Since slugs are associated with earth and natural elements, he might have a calmer and more patient side to him.
Naruto's character would likely become more brooding. Sephiroth's influence could make Naruto more introspective and less likely to wear his heart on his sleeve. He might develop a colder exterior to match Sephiroth's aloofness.
His character would develop with a stronger sense of loyalty towards Jiraiya. He would inherit Jiraiya's values like protecting the weak and seeking justice. Naruto would also be more well - versed in the ninja arts and history due to Jiraiya's teachings. This would make him more respected among his peers at an earlier stage. Moreover, he might be more patient and less impulsive as Jiraiya could teach him the importance of thinking before acting.