His decision - making changes. Naruto, who was once very considerate of others' feelings when making decisions, now only thinks about his own goals or survival. For instance, he might not hesitate to sacrifice others for his own gain if it means achieving a certain objective.
He becomes cold towards others. He no longer shows the warm smiles and friendly greetings that he used to. Instead, he might ignore people or give them cold stares.
Naruto's character may become more adaptable. Since he has to deal with being a slime, he'll need to quickly adjust to a completely different form and way of life. He might lose some of his brashness as he realizes he can't just charge into situations like he did as a ninja.
His sense of justice could become more absolute. As a god, he may not tolerate any form of evil. He would strive to purge the ninja world of all dark elements. His power would allow him to enforce his version of justice, which could be both a good thing in terms of eliminating real threats, but also a bit scary as it might limit the free will of some ninjas who are not truly evil but just made some mistakes.
Naruto may become more confident. Since being the Kyuubi's kit gives him special powers and a new status, he no longer has to prove himself as much. He could also become more solitary as he has to deal with his new identity which others might not understand.
He could become less impulsive. Seeing Himawari's more calculated and careful approach to things, Naruto might learn from her. He may start to think things through more before acting, just like he admires in Himawari. Also, he would be more of a cheerleader for her, boosting her confidence which in turn would change his own character to be more of an encourager in general.
He becomes more confident. As a god, Naruto has powers that far exceed his previous abilities, so he no longer has to doubt himself in battles. For example, he can face the strongest opponents without hesitation.
He might become more patient. As a dad, he has to deal with his kids' tantrums and mistakes, so patience is key.
Naruto's character would change in several ways. Firstly, he would become more strategic. As a lord, he has to plan for the long - term development of his land, which requires thinking ahead. His impulsiveness would be curbed as he has to deal with the complex web of politics. He would also grow in terms of wisdom. He would learn from his experiences and the advice of his advisors. His charisma would be used in a different way. Instead of just inspiring his ninja comrades, he would need to inspire all his people. His sense of justice would expand from individual cases to the overall fairness of his domain, and he would strive to make his territory a model of a just society.
He becomes more serious. Gone is the Naruto who is always cracking jokes.
In this fanfiction, Naruto could turn ruthless in terms of his relationships too. He might cut off ties with those he used to consider friends if he feels they are holding him back. His once warm and friendly attitude towards others could be replaced with a more calculating and self - centered one. He may start using people to achieve his goals rather than working together as he did before.
Naruto might become more withdrawn like Gaara was initially. Gaara was isolated due to his power and the fear others had of him. So Naruto could start to keep to himself more, losing some of his boisterous and friendly nature.