Naruto's character would develop in a rather dark direction. He'd become more secretive as he doesn't want his friends to know about his use of the dark side. His sense of humor might disappear. He'd be constantly fighting the urge to give in to the more extreme aspects of the dark side, like aggression and a thirst for power. This would also make him more self - reliant in a negative way, as he may start to think that only the dark side can help him in difficult situations, rather than relying on his friends and the power of friendship like he used to.
His character would become more complex. He might start as a naive user of the dark side, thinking he can control it. But as time goes on, it would make him more brooding and solitary. His once bright and optimistic view of the world would be clouded.
If Naruto uses the dark side of the force, his character development would be quite a journey. Initially, he may gain a sense of power and confidence that he didn't have before. However, as he delves deeper, his values would start to shift. He could become more ruthless in achieving his goals. His relationships with his friends, like Sasuke and Sakura, would be severely tested. They might try to bring him back from the dark side, which would lead to internal struggles within Naruto. Eventually, he would either succumb completely to the dark side or find a way to redeem himself, and either way, his character would be forever changed from the innocent boy he once was.
His character would become more cynical. He'd lose his naivete and optimism. Instead of believing in the good of people, he'd see only their flaws.
In a fanfic where Naruto uses the Force, his development would be interesting. He might start to use the Force to better understand his opponents. For example, he could use it to predict their moves, similar to his ability to sense chakra. His ninjutsu training could be combined with the Force training. Maybe he'd learn to levitate himself or objects using the Force, which would add a new dimension to his combat style. And his understanding of the world around him would change as he discovers the power of the Force.
His character would become more complex. He might struggle with the power of the force, just as he did with his own growing ninja powers. The temptation of the dark side of the force could be a new internal conflict for him.
One possible plot is that Naruto is tricked into using the dark side of the force. An enemy could deceive him, making him believe that it's the only way to save his village. As he uses it, he starts to change. His relationships with his friends become strained as they notice the dark influence on him. He then has to find a way to break free from the dark side's grip before it's too late.
He might become more confident in his abilities. With the speed force, he would have an edge in combat and could take on tougher opponents.
If Naruto could use the force, his combat abilities would be enhanced. He could use the force to sense enemies from a greater distance, like he uses his chakra sensing. Also, he might be able to use the force to perform even more acrobatic moves during battles, making him even more formidable against opponents like Sasuke or Orochimaru.
He would likely become bitter. Abandonment at a young age can have a huge impact on a character. Dark Naruto might develop a cold exterior and a distrust of others. He may be more prone to using violence as a solution, having grown up without the love and guidance of Kushina.
He could develop a sense of self - doubt. Maybe the process of using Chibaku Tensei makes him question if he's becoming too powerful and if he's still the same Naruto. He might worry that his friends will start to see him differently, as someone who wields such a terrifying ability. This could lead to some internal struggles within his character as he tries to balance his new power with his old self.
Naruto's character would likely become more cynical. His abandonment by family would shatter his once - positive view of the world. He might start to see the world as a cruel place where only the strong survive, leading him to embrace his dark side to gain power.
Naruto's character would become more cynical. He'd lose his usual optimism and be more distrustful of others. His sense of justice might be warped, as he now feels that he has been wronged. He could start to see power as the only thing that matters, rather than the bonds he once cherished.