Fanfiction expands on the existing Naruto powers in unique ways. In the original, the Sharingan has specific abilities. But in fanfiction, it could be evolved to have additional powers such as the ability to predict not just an opponent's moves but also future events in general. Also, some fanfictions introduce hybrid powers that combine different ninja techniques from different clans. For example, a character might have a power that combines the Inuzuka clan's beast - like abilities with the Hyuga clan's gentle fist technique, which creates a completely new and exciting power dynamic that is not part of the original Naruto series.
In fanfic, Naruto's Rasengan could have additional abilities. Maybe it could split into multiple smaller Rasengans that can target different enemies simultaneously, while in the original it was mainly a single, concentrated attack.
Fanfiction often explores the combination of powers in ways not seen in the original. In the books, each type of magic seems to be somewhat separate. However, in fanfiction, a character might be able to blend potion - making skills with combat magic. So, they could create potions that enhance their spell - casting abilities during a duel, which is a concept not really in the main series.
The original Naruto series has a defined set of rules and character arcs. However, in Naruto fanfiction, the facts of life can vary widely. In the original, the ninja world has a certain structure and hierarchy. But in fanfictions, this structure can be completely overturned. For instance, the hidden villages' politics could be rewritten to create a more utopian or dystopian setting. Also, character personalities can be altered. A character who was portrayed as a villain in the original might be redeemed in a very different way in fanfiction. And the concept of time and aging can be played with. In fanfiction, characters might age at a different rate or time - travel could be introduced, which is not a common element in the original Naruto series.
In Naruto fanfiction, antagonists might be given different motives. For instance, an antagonist could be made to have a more sympathetic backstory, like Pain. In the original, his actions were more straightforwardly villainous, but in fanfic, he could be shown as a product of a more complex situation. In Bleach, an antagonist like Yhwach could be changed. Maybe in fanfic, his plans for the Soul Society are not as cut - and - dried as in the original, and there are more nuances to his actions.
Well, in fanfiction, shinobi rules can be much more extreme. For example, in the original series, the rule about not killing comrades has some flexibility in certain situations. But in fanfiction, this rule might be made absolute with harsher punishments for breaking it. So it changes the dynamic of how characters interact and the risks they take.
In the original series, we follow Naruto's growth in terms of his ninja skills and relationships. However, in 'naruto is a mystery fanfiction', there could be a shift towards uncovering secrets. For instance, instead of just fighting Akatsuki, the characters might be trying to figure out the Akatsuki's true motives and hidden plans, which were not the central focus in the original.
The main difference is the focus on Naruto's son. In the original series, Naruto was the main character. Also, the fanfiction may introduce new villains or story arcs related to the son.
In the original Naruto series, the insect summons are mainly used for spying and some basic combat. But in fanfiction, they can have all kinds of crazy powers. For example, in fanfic, an insect summon might be able to control the weather, which is something not seen in the original.
The characters in the original Naruto are all from the Naruto universe. However, in 'naruto oc the gamer fanfiction', there are original characters created by fans. These OCs often bring in new personalities and abilities that are influenced by gaming concepts, which is a big difference.
The original Naruto series focuses on Naruto's journey to become Hokage and his relationships with his friends and foes in a more 'grounded' way. However, 'naruto godly power fanfiction' usually takes the story in a more fantastical direction. There could be entire new arcs dedicated to Naruto exploring his godly powers, which might involve him traveling to different dimensions or facing enemies that are far beyond the scope of the original series.