In the original series, Naruto mainly copied jutsu through observing and then mimicking the hand signs. In fanfiction, he might copy jutsu just by thinking about it or having a special power - up that allows him to copy jutsu without even seeing the full sequence of hand signs.
In fanfiction, Naruto could copy jutsu in more extreme ways compared to the original. For instance, in some fanfictions, he can copy jutsu from other dimensions or from long - dead ninjas. In the original series, his jutsu - copying was more limited to what was present in his own world and what he could directly observe. Also, in fanfiction, the process of copying might be faster or have different side effects that are not present in the original Naruto show.
In the original Naruto series, orbs might be more straightforward in their use. But in fanfiction, they can be used in crazy ways. For instance, they could be used to time - travel or to create alternate universes. Writers in fanfiction have more freedom to be creative with the orbs.
In fanfiction, the Chunin Vest can be more personalized. While in the original series it mainly represents rank, in fanfictions, it might have custom embroidery or markings added by the character themselves to show their individuality.
In fanfiction, naruto clones can have enhanced abilities. For instance, they might be able to hold chakra for much longer than in the original. This allows them to perform more complex jutsu without disappearing quickly.
In fanfiction, the reanimation jutsu might have extended or modified limitations. For instance, in the original, there were clear rules about the caster's control over the reanimated. But in fanfiction, a writer could create a scenario where the reanimated can break free of that control more easily. Also, the source of the sacrifice for the jutsu could be different. In the series, it was usually human sacrifices, but fanfiction might explore using other forms of energy or substances.
His relationships can be changed. In the original, his interactions were somewhat limited. Fanfic authors might give him deeper friendships or romances. For instance, he could have a romantic relationship with a character that was not in his story arc in the original Naruto.
Fuuinjutsu in Naruto fanfic often has different levels of complexity compared to the original. Fanfic writers may introduce new types of seals that have unique properties not seen in the show. For instance, a seal that can transfer a person's soul into another body. Also, the power levels of existing fuuinjutsu might be exaggerated in fanfic to create more intense storylines.
In the original series, Naruto and Hinata's relationship develops slowly over time with Naruto being mostly oblivious to Hinata's feelings. In a vampire Naruto fanfiction, the fact that Naruto is a vampire would add an element of danger and secrecy. Hinata might be initially scared but also intrigued. Their relationship could develop faster as they are thrown into situations where they have to rely on each other more quickly, like when Naruto has to protect Hinata from vampire hunters or other threats related to his new nature.
In the original story, Naruto had to figure out a lot on his own. But in this fanfiction, with Minato as his sensei, Naruto's character would be shaped by Minato's teachings. His values would be more in line with Minato's. He might be more calm and collected in battle, having learned from Minato's calm demeanor. His development would also be influenced by Minato's relationships with other characters, like Jiraiya. Naruto could have a different view of his own future as a ninja, perhaps aiming to be more like Minato in his leadership and ninja skills.
In fanfiction, the world of Naruto is often expanded upon. Regarding Naruto's ability to copy jutsu, it can be a central plot point in some stories. For example, a fanfiction might have Naruto encounter a powerful enemy with a jutsu he's never seen before. His ability to copy it could be the key to his victory. Or perhaps the fanfiction explores the consequences of Naruto copying too many jutsu, such as losing control of his chakra or having his own identity as a ninja become muddled because he's using so many different copied techniques. There are countless possibilities when it comes to Naruto's jutsu - copying ability in fanfiction.
In the original series, Naruto was more of a regular ninja (with the nine - tails being a part of him but not in a full 'demon' form). In a Demon Naruto x Hinata fanfiction, Naruto's more demonic nature might make him more of an outcast initially. Hinata, being the kind - hearted person she is, would probably be one of the few to reach out to him. Their relationship would develop faster in terms of Hinata being more of a protector and comforter to Naruto's troubled self, compared to the original where Naruto was often the one protecting Hinata.