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.
Naruto as a force master in fanfiction would likely develop a more spiritual side. The force has strong spiritual elements, and this would blend with Naruto's existing beliefs. He might start to see the world in a different way, having a deeper understanding of the balance between good and evil. His relationships with his friends would also change as he becomes more powerful and different. For instance, Sasuke might view him with more suspicion or envy, which would add new layers to their dynamic. And Naruto would have to learn to use his new force powers responsibly, which could be a major part of his character development.
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.
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.
Naruto's character might become more cautious. Since the eight gates can be very dangerous, he would need to be careful about using them. This could lead to a more mature Naruto. He would also have a new sense of responsibility as he holds such a powerful ability.
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.
Naruto's character could become more complex. He'd have to deal with the moral implications of using Jiongu. Since Jiongu has some rather strange and powerful abilities, Naruto would need to ensure he doesn't misuse it. This would add depth to his character as he'd be constantly making decisions about when and how to use this new power.
He would probably become more mature faster. Being in the past, he would face different challenges compared to his own time. This could force him to think and act more strategically, thus enhancing his growth as a ninja and as a person.
His character could become more adaptable. He'd have to adjust to Iwa's culture and way of life. This would make him more well - rounded.
His character could become more serious. Since Creepypasta is full of dark and spooky elements, Naruto might lose some of his naivete. He'd be more aware of the potential threats that lurk in the shadows, both in the real ninja world and in the world of his newfound interest.
His character could become more self - assured. Tsunade's belief in him would boost his confidence further. He might become more strategic in combat, learning from Tsunade's battle - hardened experience.
His character would likely be more wild and free - spirited. Dragons are not bound by human rules, so Naruto might be less inclined to follow traditional ninja etiquette.