Another change in fanfic could be Naruto's understanding of the ninja world. He could start to question the traditional shinobi values more deeply and try to bring about a more radical change in the system. This could lead to him being more of a revolutionary figure than just a hero in the village.
The plot changes would be interesting. Naruto's presence might make the Noblesse characters question their own values. His journey to be recognized and respected in his own world could translate into a similar arc in the Noblesse world. He could also introduce new forms of combat and training. For example, his ability to learn new jutsus quickly could inspire some of the Noblesse characters to seek new ways of increasing their power. And his sense of loyalty and friendship would surely shake up the relationships in the Noblesse fanfic.
His view of justice would change. Naruto believed in a very straightforward form of justice where the good guys win and protect the weak. But as Darth Vader, he'd be more about maintaining order through fear. He'd use his new - found power in a much more forceful and sometimes cruel way. His relationships would also be different. Instead of having friendly and equal relationships with his comrades, he'd be more of a feared leader. He'd be above them, not on the same level as he was before. His character would lose its innocence and become much more complex and dark.
I haven't read this particular fanfic in detail. But generally, in fanfics about Naruto in the Blood Prison, his changes could involve his growth in power, his relationships with other characters in that unique and often dangerous setting. Maybe he discovers new jutsu or overcomes some inner demons while locked up there.
When his personality changes in fanfic, like if he becomes more cynical or less trusting, it changes the way he interacts with other characters. His relationships might become more strained or he might make new alliances. This can lead to a whole new set of plotlines and character arcs.
He might become more reserved. Since he's now a graduated ninja, he has to be more cautious about what he says and does, so he could lose some of his former exuberance.
Well, Naruto is a character full of energy and always eager to prove himself. He has a strong sense of justice. Haku, on the other hand, is more of an enigma at first. He has a tragic past which has shaped him into a very loyal and self - sacrificing person. In this fanfic, their individual traits will play a big role as the small changes happen to them. And since it's about them specifically, they are the main characters.
Well, it could be about small changes in the relationship between Naruto and Haku. Maybe they start to understand each other's pasts more deeply, leading to a stronger bond. For example, Haku could show Naruto some hidden ice - based jutsu techniques that are different from what he already knows, and in turn Naruto could share his dreams of becoming Hokage with Haku in a more personal way.
Well, one major plot change could be in the power dynamics. Since Naruto in Anbu is likely more skilled and experienced. He might take a more dominant role in Team 7's missions. For example, he could quickly assess and handle dangerous situations that the original Team 7 might struggle with. This could also change the relationships within the team. Sasuke might be more competitive towards Naruto, seeing him as an even greater rival. And Sakura might have more admiration or fear towards Naruto because of his Anbu status.
Naruto would likely be more brooding and introspective. Since the Uchiha are known for their deep emotions and internal conflicts, he would inherit some of that. He might also be more ambitious in terms of power, as Madara was always seeking greater power.