How would Naruto's character develop in a Naruto Demon God fanfiction?

Naruto's character would likely become more withdrawn at first. The sudden change to being a frost demon would make him feel different from his friends. But as he learns to control his new powers, he'd become more confident. His sense of justice would still be there, but it might be tempered with the knowledge of his new, potentially dangerous abilities.

His view of the world would change. He'd understand that there are greater forces at work and that he has the power to stand up to them. This could lead to him being more proactive in preventing future threats. He may also develop a deeper sense of responsibility for the entire ninja world, not just his village. For example, he might start diplomatic efforts to ensure peace among all ninja nations on a more regular basis.

Naruto could develop a more complex view of good and evil. In Sabertooth, things might not be as black and white as in his ninja world. He'd see that some members of the guild have a rough exterior but good hearts. This would make him question his previous notions of what makes a person 'good' or 'bad'. His character would also grow in terms of his magical abilities, as he'd learn new spells and techniques in this new setting.

His character would be more feral. He'd be more in tune with his instincts like the demon foxes. So he might be quicker to anger and more impulsive in his actions.

Naruto's character development would be complex. He would gain a new sense of purpose. In his ninja world, his goal was to protect his village and become Hokage. Now, he has to protect an entire universe. This would force him to grow in ways he never expected. He would have to learn about different cultures and species in Universe 7. His values would also be tested. For instance, he might have to make tough decisions about sacrificing one planet to save the whole universe, which would be a major shift from his usual 'never - give - up - on - anyone' attitude.

Naruto's character would likely become more stoic. Vergil is known for his calm and collected demeanor, so Naruto might start to suppress his more exuberant emotions. He could become more calculating in battles, thinking several steps ahead like Vergil does when facing his enemies.

Naruto might become more serious. Deadshot is a very serious and focused character. So Naruto could lose some of his goofy and carefree nature and become more calculating in his actions.

Naruto might become more cautious. Dealing with the Daleks, who are extremely dangerous and unpredictable, would force him to think before acting. His normal brashness might be toned down a bit.

Naruto's character would likely become more calm and introspective. He'd focus more on inner peace rather than external battles.

Naruto might become more empathetic. Loving a demon means seeing things from a different perspective. He would learn to understand the outcasts more, as the demon is likely an outcast in the ninja world. This would make him more inclusive in his actions towards others who are different.