Well, he might start training with it immediately. Naruto is always eager to get stronger, and a legendary scythe could be a great addition to his arsenal. He could learn new jutsu specifically designed to work with the scythe, like combining his chakra with the scythe's unique properties.
It could be an old ninja who has been observing Naruto from afar. This ninja might have seen Naruto's potential and decided to leave the scythe as a test or a way to help him reach his full potential.
One possibility is that the scythe is a key element in a prophecy. Naruto, as the main character, is fated to find it. With this scythe, he could gain new allies who are also interested in its power. However, he would also face new enemies who want to take the scythe from him. This would create a lot of tension and action in the fanfiction.
He might meet someone who is also after the scythe. This could lead to a conflict or an alliance. If it's an enemy, Naruto will surely fight to keep the scythe. But if it's someone who can help him understand the scythe better, they could team up and go on adventures together.
One possible fanfiction could be 'The Staff of the Sage'. In this story, Naruto discovers the staff during a mission in an ancient ruin. The staff has the power to control nature elements. Another one might be 'Naruto and the Mysterious Staff'. Here, the staff is linked to an old prophecy about a ninja who will save the world with a powerful relic. And there's also 'Staff of Legends: Naruto's Adventure' where Naruto has to learn how to use the staff's powers to defeat a new and powerful enemy.
It could have been left by an old ninja who passed away. Maybe it was a powerful weapon of a long - forgotten shinobi, and Naruto just stumbled upon it in an old, abandoned hideout. The shinobi might have been a hermit who lived in the outskirts of the village.
Naruto could use the staff to gain new powers. For instance, he might be able to fly or teleport using the staff's magic. It could also be a key to unlocking some ancient ninja secrets. Maybe it reveals the location of a long - lost ninja village.
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.
Well, it could be a sword with the power to cut through any jutsu. Maybe it has some special markings that only Naruto can understand. It might also be a staff that can control the elements in a unique way, giving Naruto an edge in battles.