He would become more responsible. As Hokage, he has to think about the whole village, not just his friends. So he might be a bit more serious, but still keep his positive and energetic side.
His confidence would grow even more. Being chosen as the Hokage is a huge honor and sign of trust from the village. He would carry himself with more pride, but not in an arrogant way. He would be more patient as well, listening to the concerns of the villagers and making well - thought - out decisions. For example, when it comes to allocating resources or dealing with disputes, he would take his time to understand all sides of the situation.
Naruto's personality would probably become more diplomatic. He'd have to deal with other villages and clans, so he'd need to tone down his impulsive nature. However, his core values of never giving up and believing in people would remain. He might use his new position to inspire the younger generation even more, showing them that anyone can achieve great things no matter their background.
He might become more serene. Since Sadaiam might have a calmer and more nature - centered philosophy, Naruto could adopt some of that. He'd be less impulsive in his actions and more contemplative.
His personality could also become more calculating. Since the Sannin were known for their strategic thinking, Naruto would start to think several steps ahead. He might be more secretive about his plans too. He would no longer be the open - book Naruto. Instead, he would be like Jiraiya, who had his own secrets and plans. He would also show more patience, which is something he lacked before but the Sannin had in abundance when dealing with complex situations.
One possible plot could be Naruto having to prove himself to the village elders. He might start by implementing new training programs for the younger ninjas, inspired by his own journey. He could also focus on improving relations with other villages, using his charisma and unique perspective as someone who was once an outcast.
His relationship with Sasuke would likely be affected. Sasuke might see Naruto being forced into this role and feel that Naruto is losing his freedom, which could either make Sasuke more protective or more distant. Naruto's friendships with the others like Shikamaru would also change. Shikamaru, who has a good understanding of leadership, might become more of a mentor - like figure to Naruto in handling the political aspects of being Hokage.
If Naruto doesn't become Hokage, his relationship with Sasuke might be less strained. Since there's no need to compete for the top position in the village, they could focus more on their friendship. They might go on missions together more often just for the sake of adventure and to protect each other.
Under Naruto as the 5th Hokage in fanfiction, the village would experience a cultural shift. Since Naruto values all kinds of people, the village would be more open to different ideas and ways of life. New forms of ninja techniques might be developed as he encourages everyone to explore their potential. Also, the village's defenses would be strengthened not just by physical means but also by the strong bonds between the villagers, which Naruto would foster.
His personality would likely be more disciplined. The Hokage's influence would instill a sense of order in Naruto. He'd be less likely to pull pranks just for attention.
His personality might become more refined. Instead of being the rowdy Naruto we know, he could be more composed and polite due to the influence of the daimyo's court.
Naruto might become more aggressive at first. The influence of Venom could bring out his darker side. But as he gets used to it, he would learn to balance it with his usual positive and determined self.
Naruto might become more calm and collected. Goku has a certain simplicity and focus in his personality. Naruto could pick up on that and not be as impulsive as he usually is.