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.
There's a possibility that it was placed there by an enemy as a trap. They knew Naruto's curious nature and thought that he would pick it up. Once he does, it could trigger some sort of dangerous mechanism or summon a powerful enemy to fight him.
Another idea is that it was a gift from a future version of himself. In some fanfictions, time - travel elements are involved. The future Naruto could have sent the scythe back in time for his present - self to find, knowing that it would be useful in some upcoming battles or challenges.
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.
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 sees Naruto's potential. This ninja might have left the sword as a way to help Naruto in his future battles.
One potential character could be Sasuke. Imagine in a dark, alternate universe fanfic where Sasuke, instead of using his sword, wields a scythe. It could be a symbol of his more menacing and reclusive nature. He might use it with his Sharingan abilities, making his strikes not only powerful but also unpredictable as he can anticipate his opponents' moves.
Maybe it's a magical creature. For instance, a centaur could give it to Harry. Centaurs are known for their knowledge of magic and prophecies. They might believe that Harry is the one destined to have the three - bladed scythe to fulfill some important task in the wizarding world.
Perhaps it was a weapon created by a rogue ninja with unique powers. And for some reason, it found its way to Naruto in Wave. It might also be a weapon that was enchanted by a sorcerer long ago and has special abilities that Naruto will discover as he uses it.
He might use a scythe with a chakra - infused blade. This would give it an extra edge (literally) in combat, allowing it to cut through tougher materials. The scythe could also have some sort of sealing mechanism on it, similar to his kunai, so he could store small items or even chakra - based attacks within it for surprise strikes.
The origin could be some ancient, long - forgotten magic. Maybe it was created by a powerful and now - extinct clan. They might have imbued it with a spirit or some form of intelligence for a specific purpose, like protecting a hidden treasure or an important location.