Naruto's character would likely be more calm and collected. Yugito Nii's influence might make him think before he acts. He would still be determined but in a more refined way.
His character would develop a deeper understanding of the tailed beasts and their power. Yugito Nii, being a jinchuriki herself, could pass on her knowledge. Naruto would also become more empathetic towards the struggles of those with tailed beasts inside them. He might be less impulsive in his actions regarding the Akatsuki, as he would have a different perspective on the whole situation. His sense of loyalty would expand beyond Konoha to include Yugito Nii's community as well.
One possible plot could be that Naruto grows up with Yugito Nii's unique teachings. He might learn different jutsu styles from her. For example, he could master some of the Nii clan's secret techniques. Yugito Nii could also instill in Naruto a different set of values compared to what he would have learned in Konoha on his own. This could lead to Naruto having a more nuanced view of the ninja world and different relationships with the other villages.
Naruto's character could become more in - tune with the spiritual side of things. Since Yugito has a connection to the Nibi, Naruto might start to understand the nature of tailed beasts better. This could make him more empathetic towards them. Also, he could pick up some of Yugito's calm and collected nature, which would be a contrast to his usual boisterous self.
His relationship with Sasuke would likely be very different. Without the shared experiences in Konoha, their initial rivalry might not be as intense. Naruto might not be as desperate to bring Sasuke back. And his relationships with his other Konoha friends like Sakura and Kakashi would also change. He'd be more connected to Yugito's friends and allies instead.
Naruto's development would be significant. Firstly, he'd grow to be more understanding of different cultures as he adapts to the Cloud Village's way of life. Emotionally, he'd become more stable with a proper family support system. Yugito's guidance would help him in his ninja training, making him a more well - rounded shinobi. He'd also learn to be more diplomatic as he bridges the gap between Konoha and the Cloud Village through his relationship with Yugito.
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.