The cursed sword could enhance Naruto's physical strength. Since Naruto already has a lot of raw power, the sword might multiply it, making his punches and kicks even more powerful. For example, if he punches an enemy while holding the sword, it could send the enemy flying farther than normal.
The origin of the cursed sword could be from an ancient and evil clan. Maybe they used dark magic to create it, and it was lost over time until Naruto discovers it by chance. For example, it could have been buried in a forgotten tomb that Naruto stumbles upon during a mission.
The sword might have special abilities that Naruto can tap into. For instance, it could allow him to use a new type of chakra or jutsu. Maybe it gives him the ability to control shadows or fire in a way he couldn't before. This would completely change his fighting style and make him even more formidable against his enemies.
The demon sword could potentially give Naruto new jutsu. Maybe it has some sort of dark energy that he can learn to manipulate and turn into unique attacks. However, he would have to be careful not to let the dark side of the sword overtake him. He might start with simple things like using the sword to focus his chakra in a different way, creating new types of rasengan-like attacks.
In many fanfictions, the cursed eyes force Naruto to grow up faster. He has to deal with the consequences of having this power that others may fear or want to steal. This makes him more cautious and less reckless in battles. He starts to think more strategically instead of just charging in head - first like he used to.
There are fanfictions where the cursed sword has a mind of its own. For example, it might choose its wielder in a rather unexpected way. In some stories, the sword might be cursed with the ability to absorb the chakra of its opponents, and the protagonist has to figure out how to use this power without being consumed by it. This can lead to some really exciting plot twists and character development.
The sword could make Naruto more cautious. Since it's sentient, it might have its own motives that Naruto doesn't fully understand at first. So he has to be more careful about his actions and decisions.
In the original Naruto story, Naruto doesn't have an overarching 'curse' in the traditional sense. Fanfiction with this concept adds a new layer of conflict. The original focuses more on Naruto's journey to become Hokage and gain acceptance, while the cursed fanfiction centers around the challenges brought by the curse.
In some fanfictions, Naruto might obtain Cloud's sword through a series of adventures. Maybe he helps the Cloud Village in a great battle and as a reward, he is given the sword. Or perhaps he discovers it during an exploration of an ancient ruin that has a connection to the Cloud Village's history.
Cursed swords in Naruto fanfiction can also be a great tool for character development. If a character wields a cursed sword, they have to deal with the potential negative effects of the curse. This could lead to internal struggles, like Naruto might struggle with the sword's dark influence while trying to stay true to his values. It can also create interesting relationships, as other characters might be wary or intrigued by the sword - bearer. Additionally, the origin of the cursed swords can be a source of mystery, leading to exploration of ancient ninja lore and secrets within the fanfiction.
Well, in some fanfictions, Naruto might obtain the overpowered sword through a mysterious inheritance. Maybe it was left by a powerful ninja from the past and Naruto discovers it in a hidden cave or something.