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.
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.
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 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.
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.
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.
Perhaps a foreign ninja who comes to the Hidden Leaf Village. They bring with them the scythe - using techniques from their own land. This ninja could be on a mission to learn more about the chakra system in the Naruto world and in exchange, teach their scythe skills. Their different cultural background would add an interesting dynamic to the story as they interact with the local ninjas.
Maybe the scythe was once owned by a powerful shinobi from a forgotten clan. Naruto finds it and as he wields it, he starts to have strange visions. These visions lead him to new places and he uncovers a conspiracy in the ninja world. The scythe could also change Naruto's fighting style. Instead of his usual close - combat and ninjutsu attacks, he starts using more long - range and slashing - based attacks with the scythe.
One possible plot could be that Naruto discovers an ancient scythe during one of his adventures. This scythe could be imbued with some sort of special power, like the ability to cut through any chakra - based defense. Naruto then has to train to master using this scythe, which is a completely different weapon from his usual ninja tools. He might face challenges as his friends and the village elders are skeptical about him using such an unorthodox weapon.
Well, perhaps Harry could discover that the three - bladed scythe has some magical powers. It might be a weapon against a new dark force that he has to face. Maybe it was left behind by an ancient wizard and holds the key to unlocking a great mystery.