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.
One interesting plot could be a character finding a long - lost lightning sword that has special powers. For example, it might be able to control thunderstorms or enhance the user's speed. Another plot could involve a battle between two ninja clans over the possession of the lightning sword. The sword could hold a secret that is crucial to the future of the Naruto world.
Often, Naruto himself is a main character. Since he's the protagonist of the original series, it's common to see him involved with the lightning sword in fanfiction. Sasuke could also be a main character as he is always in search of power and the lightning sword could be something that attracts him. Another character might be Kakashi, who could guide the younger ninja in their journey with the sword.
The Godly Sword Lightning-Controlling True Spell was a true sword technique in the Celestial Bane series. It was one of the Qingyun Sect's mountain-suppressing techniques. It used its body as a guide and the divine weapon in its hand to attract the Nine Heavens Divine Lightning to attack. Its power was extremely powerful. However, to cast this technique, the caster needed to have extremely high cultivation, physique, and weapon conditions. Otherwise, they might be struck to death by the heavenly lightning that they attracted. In Celestial Bane, the Godly Sword Lightning-Controlling True Spell was not used often. Only Daoist Cang Song, Lu Xueqi, and a few others had used it.
Perhaps in the fanfiction, the Black Lightning Sword was created by a long - forgotten clan. The main character, who is an outcast in his village, stumbles upon the sword. With it, he begins to train and master the black lightning powers, all while trying to prove his worth to the village that once shunned him. He could also form an unlikely alliance with a former enemy because of the sword's existence.
In a fanfiction about Naruto's Lightning Release, there could be a story where a young girl discovers she has latent Lightning Release abilities. She trains hard under Kakashi to master it. Along the way, she befriends other ninjas and together they form a team. Their adventures involve using Lightning Release to solve mysteries and defeat enemies. For example, they might use Lightning Release to track down a missing-nin who has a special ability to hide from normal detection methods.
In some fanfictions, it could be an enemy-turned - ally. This character, who originally fought against Naruto, realizes his strength and potential and decides to teach him black lightning as a way to make amends or to join forces with him for a greater cause.
One implication is that his speed will increase tremendously. Lightning is known for its quickness, so Naruto would be able to move at lightning - fast speeds, making it difficult for his enemies to track or counter him. This would give him an edge in battles, especially against opponents who rely on slow - moving attacks or are not as agile.
Well, in many fanfictions, Naruto might learn black lightning through intense training. Maybe he gets some special guidance from a powerful shinobi who has mastered it, like Kakashi or some other unknown but strong character. He could also discover some ancient scrolls that contain the secrets of black lightning.
Another way could be as a result of a special encounter. Maybe he discovers a hidden scroll or a mysterious artifact that imparts the power of lightning control to him. This discovery could be accidental, like when he's exploring an ancient ruin or during a battle when he stumbles upon something unexpected.