The sword might be able to enhance Naruto's existing jutsus. For example, his Rasengan could become more powerful when combined with the sword's energy. It could also give him new elemental powers, like the ability to control lightning or fire in a different way than before.
Well, he might discover that the sword has some special powers. Maybe it can cut through any material, or it could have the ability to absorb chakra. He could start training with it to become even stronger in battle.
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.
In a 'Naruto Finds a Legendary Sword' fanfiction, a lot can happen. The sword might have a connection to Naruto's family. It could be a heirloom that was lost generations ago. This discovery could lead to Naruto learning more about his family's past and his own heritage. He may also have to go on a quest to fully understand the sword's powers and how to use them. He might meet new allies along the way who help him in his journey. There could be epic battles against those who want to steal the sword from him, and Naruto would have to use his wits and newfound sword skills to defend it.
A possible fanfiction could be where Naruto discovers the sword in an ancient temple during a mission. The sword has inscriptions that are only readable by those with pure hearts. Since Naruto is known for his good nature, he can read it and unlock the sword's true potential which gives him abilities like enhanced speed and strength.
If Naruto finds his mother's sword in a fanfiction, it might lead him on a journey of self - discovery. The sword could be a symbol of his heritage. It could also attract the attention of enemies who either feared his mother or want the power of the sword for themselves. This would then put Naruto in a dangerous yet exciting situation where he has to protect the sword and learn about its significance.
Perhaps it's an ancient artifact with power. It could be a weapon like a sword or a staff that has been enchanted with some sort of magic. This power could enhance Naruto's physical abilities and give him an edge in battles. When he wields it, he might be able to access special techniques related to the artifact.
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.