Naruto might become more confident. Being a dragon gives him new powers, and with that comes a sense of self - assurance. He may also become more solitary at first as he tries to understand his new form. But as he gets used to it, he'll start to integrate his dragon side with his ninja self.
His relationships with his friends could change. Some friends might be in awe of him, while others might be a bit scared. Naruto would have to work hard to show them that he's still the same person inside. Also, his enemies would view him in a whole new light. They'd be more cautious around him, which would force Naruto to adapt his battle strategies even more.
One possible plot development could be Naruto struggling to control his new dragon powers. He might accidentally cause destruction in the Hidden Leaf Village at first. Then, he'd have to go on a journey to learn how to master these powers, perhaps with the help of an old sage or a mysterious dragon - like creature.
Naruto could become more confident. With Kushina as his maid, he'd have someone who truly believes in him at home all the time. He might grow out of some of his insecurities faster. For Kushina, she could develop a new sense of purpose. Instead of just being a memory or a lost hero, she's actively involved in Naruto's life again.
In this fanfiction, Naruto might experience some significant character development. He could initially be very confused and conflicted about the situation. On one hand, he has his mother as a servant, which is a strange and uncomfortable idea. This could lead to him being more introspective. As time goes on, he might start to see Kushina's value in a new light, not just as his mother but as someone who is loyal to him in this new role. This could make him more empathetic towards others in servant - like positions. He may also become more decisive in his actions, as he now has someone directly under his authority and has to make decisions regarding Kushina's tasks and well - being.
She could become more confident in her new identity. Starting as Harry from a different world, she'd have to adapt to being a ninja and Naruto's sister. This new role would force her to step out of her comfort zone and grow. For example, she might have to learn physical combat skills which she didn't rely on as much in the wizarding world.
Naruto would likely experience a significant shift in his personality. He might become more aggressive and less trusting as he turns into a monster. His friends would also change in their approach to him. For instance, Shikamaru, known for his intelligence, would have to come up with new strategies to deal with Naruto's new state. He might be more cautious around Naruto.
For Naruto, he could develop more understanding of the darker side of the ninja world through his interactions with Tayuya. Tayuya, on the other hand, might start to see the value of friendship and loyalty like Naruto has. For example, Naruto's unwavering belief in his friends could rub off on Tayuya, making her question her previous solitary and somewhat ruthless ways.
In the 'naruto becomes sage of the six paths fanfiction', perhaps Naruto would go on a journey to fully understand and master the powers of the Sage of the Six Paths. He could visit different hidden villages to learn about their ancient secrets related to the Six Paths. This would not only expand his knowledge but also help him form new alliances. And he may use his newfound status to bring about a new era of peace in the ninja world.
In this fanfiction, perhaps Naruto's physical abilities are enhanced as the Kyuubi's kit. He might be able to move faster, jump higher, and his strength could be superhuman. Also, his relationship with Sasuke could change. Sasuke might see Naruto as an even greater threat or, on the other hand, an ally he needs to understand better. And Naruto could start to have a different understanding of his own identity and place in the ninja world.
Louise could develop more confidence. Summoning a dragon is a huge deal, and as she learns to work with it, she'll realize her own strength. Maybe she becomes less self - doubting.
One possible plot development could be Naruto's ideals getting warped due to some traumatic event. For example, if he fails to save a dear friend, he might start to believe that the only way to achieve true peace is through extreme force. Another development could be his relationships turning sour. Maybe his friends start to fear his new, twisted self and Naruto, feeling betrayed, becomes even more deviated from his original self. Also, his view of the ninja world could change completely, seeing it as a place that needs to be remade in his own image rather than following the traditional ways.