He could become more isolated. Since he is a clone of such a feared being, people in the Naruto world might avoid him. This would be a big change for Naruto who was always surrounded by friends. He would have to deal with loneliness and find new ways to prove himself and his worth, different from how he did in the original story.
Naruto would probably have a more complex view of power. In the original, he was all about becoming stronger to protect his friends. But as a Darkseid clone, he might question the nature of power. Darkseid uses power for domination, and Naruto would have to struggle not to be influenced by that aspect while still using his new - found powers for good.
Naruto might become more brooding. The dark training from Darkseid could make him less of the cheerful, optimistic Naruto we know. He may be more secretive about his new powers and training.
In this fanfiction, Naruto's character would experience significant growth. He'd be forced to confront the idea of family in a whole new light. His concept of good and evil would be challenged. Naruto, who has always been about protecting his friends and the village, now has to think about a much larger scale. He might start to question his own identity and purpose. His development would also involve learning about Darkseid's powers and trying to use them for good. He could become more of an outcast as some in the ninja world fear his connection, but this would only strengthen his resolve to prove himself. His journey would be filled with internal struggles and external battles, all of which would shape him into a more mature and complex character.
His sense of justice could be warped. Naruto has always fought for what he believes is right, but as a Darkseid fan, he might start to think that power is the ultimate arbiter of right and wrong. This could lead him to make decisions that are more self - serving rather than for the good of the village. For example, he might pursue power at all costs, even if it means sacrificing the safety of his friends in the short term to gain more strength in the long run. He would become more calculating and less impulsive in his actions, which is a big change from his usual head - first style of dealing with problems.
In this fanfiction, perhaps Naruto as a Darkseid clone discovers new powers. Since Darkseid is a powerful being in the DC universe, Naruto could inherit some of that raw power. He might have to learn to control it, just like he learned to control his chakra. His friends in the Naruto world could be either afraid of him or try to help him come to terms with this new identity.
Naruto would probably be very curious about the clone trooper culture. He might be shocked at first by the fact that they are all clones. But his friendly nature would make him quickly start making friends among the clone troopers. He would try to understand their military structure and how they operate as a unit.
Naruto's character might become more brooding and mysterious, like the Undertaker. He would lose some of his usual exuberance and become more focused on intimidation. Instead of his loud and energetic self, he would be quieter, with a more menacing presence.
Naruto could also become more powerful but in a different way. His chakra might be tainted with a touch of the demonic, giving him new abilities that are both a blessing and a curse. He has to learn to control these new powers, which might make him seem more withdrawn as he trains in isolation to avoid hurting others accidentally.
Naruto would likely become more stealthy. Itachi is known for his stealth and if he trains Naruto, Naruto would pick up some of those skills. He might start to rely less on his brash and straightforward fighting style and incorporate more subtlety.
Naruto's character would change a great deal. Since Acnologia is a powerful and somewhat menacing figure, Naruto would probably be more aggressive. He might not value the same things as the original Naruto, like the bonds of friendship within the village. Instead, he could be more focused on his own strength and survival. He might also be more distrustful of others, having grown up under the tutelage of someone like Acnologia.
Naruto would likely become more solemn. The environment of hell is not a happy - go - lucky place like Konoha. He would have to be more strict and less naive. His usual exuberance might be toned down as he deals with the weight of ruling hell.