Naruto's usually impulsive personality might become more calculating as a puppet master. He would need to think ahead when using puppets in battle, so he'd be less likely to rush into things.
His confidence might increase even more. Naruto was always confident as a ninja, but as a sorcerer, he has new powers at his disposal. He would feel even more capable of taking on challenges. For example, if he faces a powerful sorcerer enemy, instead of being intimidated, he would be eager to test his new abilities.
He might become more patient. As a medic, he has to be careful and take his time with patients, which is different from his impulsive fighting style.
Naruto's personality might become more reserved in some ways. As Hokage, he has to represent the village in a more solemn and diplomatic manner. He can't be as carefree as he used to be. For example, in international meetings, he has to think carefully about his words and actions.
He becomes more aloof. Instead of being the overly friendly Naruto, he might be more reserved. For example, he won't immediately trust people like he used to.
His personality might become more cautious. Since he has a greater responsibility as a guardian, he can't be as reckless as he was sometimes in the original Naruto series.
His personality might become more withdrawn. As a lich, Naruto could be feared by others, and this might make him more hesitant to interact with people. He was always so outgoing before, but now he might keep to himself more.
Naruto may also become more solitary. Sparda often fought alone, and Naruto, influenced by this, might start to distance himself from his friends at first. However, he would still have that underlying loyalty and would eventually find a way to balance his new - found independence with his relationships.
His confidence would skyrocket. Gilgamesh is extremely self - assured, and Naruto, if influenced by him, would become even more so. He'd be more outspoken about his own abilities and less likely to doubt himself in tough situations.
In this fanfiction scenario, Hiccup's personality would be a mix of his old self and new vampire traits. He'd still be the intelligent and creative Hiccup we know. But his confidence could grow in a different way. Instead of relying on his inventions and dragon - training skills, he'd start to rely on his vampire powers. This could make him a bit more cocky at times. At the same time, he'd be more in tune with the night and solitude, which could make him seem more mysterious to those around him. His relationship with Toothless would also be affected. He might worry that Toothless won't accept him now that he's a vampire, but in reality, Toothless would probably still be his loyal friend.
He might become more patient. As a dad, he has to deal with his kids' tantrums and mistakes, so patience is key.