He could become more cautious at first. Since it's a new world, he doesn't know what to expect, so he might hold back his usual boldness.
Well, initially, Naruto might be a bit more reserved as he tries to figure out the new world. However, as he starts to make friends or find a purpose in this new place, his positive and energetic side could come back in full force. He might also become more diplomatic if the new world has complex political situations. His experience in his own world with different ninja villages could give him some foundation for handling such matters, but he'd still have to learn a lot about the new world's politics.
Naruto's personality might become more adaptable. He's always been able to grow and change in his own world, but in a new world, he'd be forced to be even more flexible. He might also become more introspective as he compares the values of his old world with those of the new one. For instance, if the new world has a different view on friendship or loyalty, it could make him think more deeply about his own beliefs. And if he faces a lot of rejection in the new world, it could make him a bit more guarded, but at the same time, his determination to prove himself could also grow stronger.
Naruto could become more curious. A different world means new things to explore, new cultures, and new powers. He would be eager to learn about everything, which could make him seem more inquisitive than he already is. He might start asking a lot of questions to understand how this new world functions.
Naruto's personality could change in several ways in this fanfiction. Firstly, he might become more impatient. The Super Saiyan Rose power is extremely powerful, and he may want to use it right away to solve problems. Also, he could become more protective. Since he has this new and powerful form, he would feel a greater responsibility to protect his friends and the village. However, he would still retain his core values of friendship and loyalty. He might just be a bit more headstrong when it comes to defending those he cares about.
If Naruto becomes involved with Slenderman in a fanfiction, his usually cheerful and determined personality might become darker. He could be more withdrawn as he grapples with the strange and often terrifying aspects of Slenderman's world.
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.
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.
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.
Naruto might become more reserved. Growing up under Zeltrech, he could be exposed to a more sophisticated and perhaps less rowdy environment compared to Konoha. So instead of his usual loud and brash self, he could develop a more calm and calculated side.
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.
Well, first of all, Naruto's usually carefree and positive personality could be tempered with Ace's more complex emotional side. Ace had a lot of baggage related to his family and his identity as a pirate. So Naruto might start to have some internal struggles about his place in the world. He could become more reserved in some ways, like not being as quick to share his feelings. At the same time, his loyalty would become even more intense. He would be willing to go to greater lengths for his friends and the village, almost to the point of self - sacrifice, which was a big part of Ace's character. And his view of power might change too. Instead of just seeing it as a means to protect and be recognized, he could see it as a way to uphold a certain code, like Ace's code among the pirates.