Well, in this fanfiction scenario where Naruto becomes a Suna Nin, it could lead to some really interesting alliances. He could form closer bonds with Gaara and the other Sand ninjas. This might result in a united front against common enemies that was different from the original story. His training in Suna would likely be different too. Instead of learning from Jiraiya, he could be trained by a Suna master, which would give his skills a unique Suna - style flavor.
If Naruto becomes a Suna Nin in fanfiction, the plot would change drastically. For one, his relationships with characters in Konoha would be strained. His bond with Sasuke might take a different turn as they would be on opposing sides. Also, Naruto would have to adapt to Suna's culture and ninja techniques. He might learn new jutsus specific to the Sand Village, which could make him an even more formidable ninja in a different way than he was in Konoha.
One possible plot could be that Naruto is sent to Suna as a part of a diplomatic exchange of skills. He starts teaching the young shinobi in Suna his unique jutsu like the Rasengan. He also shares his experiences of perseverance and friendship, which helps in changing the mindset of some of the more cynical Suna students.
In a 'naruto becomes a missing nin fanfiction', perhaps Naruto discovers some dark secrets about the village leadership. These secrets are so dangerous that the village wants to silence him. He then decides to go rogue to expose these secrets to the world. As a missing nin, he might form alliances with other outcasts who also have a grudge against the current system.
The nin dog could change Naruto's life by making him more responsible. Since he has to take care of the dog, he'll have to think about someone else's needs. For example, he'll need to make sure the dog is fed, trained, and healthy. This will give him a new sense of purpose outside of his normal ninja training and goals.
If Naruto becomes Madara Uchiha in fanfiction, it could drastically change the plot. Firstly, the relationships would be turned upside down. Naruto's friends might see him as an enemy, especially Sasuke who has a complex relationship with the Uchiha legacy. The power dynamics in the ninja world would also shift. Naruto, with Madara's power and knowledge, could either rule with an iron fist or try to reshape the world in a more extreme way compared to his original goal of peace. And the Akatsuki's plans would likely be disrupted as Naruto, in Madara's form, might have different motives regarding the tailed beasts.
In this fanfiction, Naruto might gain new and stealthy abilities as a Hunter Nin. He could be tasked with tracking down dangerous rogue ninjas. His skills in stealth and assassination, which are not typically associated with his regular character, would develop. This would add a new layer of complexity to his character and the Naruto universe in general.
In such a fanfic, it could be that Naruto discovers some dark secrets about the village leadership. These secrets are so dangerous that the leaders try to silence him. Naruto refuses to be silenced and decides to break away from the village, becoming a missing nin. He then travels the ninja world, gathering allies who also believe in exposing these secrets and fighting against the unjust system of the village.
One of his students could be Gaara's younger siblings. They would be eager to learn from Naruto, especially since he was the one who changed Gaara's life. Another could be some of the regular Suna academy students who are looking to become stronger shinobi. They would see Naruto as a great opportunity to learn from someone with his level of skill and experience.
If Naruto becomes a Hunter Nin in fanfiction, his personality would change significantly. He'd be more calculating. His usual impulsive nature would have to be toned down because one wrong move as a Hunter Nin could mean disaster. He might also become more solitary, used to working alone in the shadows rather than in a team. His sense of humor might also be more subdued as he takes on this serious and dangerous role.
As a Suna Nin in fanfiction, Naruto would have a very different daily life. He'd probably live in a different type of housing compared to Konoha. His missions would be more centered around Suna's needs, like protecting the village from threats in the desert. He'd also have to get used to the harsher climate of the Sand Village. And his friends would be mainly Suna ninjas, which means different personalities and ninja styles to interact with.
Maybe Naruto leaves to Suna because he has some personal issues in Konoha. He could be seeking a fresh start in Suna. There, he might meet new friends and foes alike. He could get involved in Suna's internal politics or power struggles while trying to prove himself as a valuable ally.