Well, in some fanfictions, he might inherit it from an unknown ninja clan. Maybe his parents left it for him and it was hidden until he discovers his true heritage.
One possible scenario in this fanfic could be that Naruto finds a magical sword. The sword might have special powers like being able to cut through any material or even having the ability to nullify jutsu. Naruto, being Naruto, would initially be confused about how to use it but would soon start to experiment. He might try to incorporate it into his combat style, perhaps using it in combination with his shadow clones to create some really cool and unexpected attacks.
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 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.
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.
Yes, there could be. Maybe Naruto discovers a hidden talent for swordsmanship. He could start by finding a unique sword, perhaps one with a special power or history. Then, he might train under a reclusive sword master. His ninja skills could blend with his new sword skills, like using his shadow clones to practice different sword techniques simultaneously. This would make him a formidable force, not just with his regular ninjutsu but also in close - combat sword fighting.
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.
Sasuke could be a great wielder. His natural affinity for lightning - based jutsu and his determination would make him a formidable user of the Black Lightning Sword. He could integrate the sword's power into his existing combat style, creating new and powerful attacks.