Well, it could be about Naruto discovering a new power related to lightning and becoming the so - called 'god of lightning'. Maybe he has to face a powerful enemy that can only be defeated with this newfound power.
Maybe an ancient being that was sealed away long ago but has now been awakened due to Naruto's newfound power. This being has a natural hatred for those who can control lightning and sees Naruto as a threat to its plans of taking over the ninja world. It has the ability to manipulate shadows and uses them to counter Naruto's lightning attacks.
Sasuke could also be a main character. His pursuit of power and his natural affinity for lightning - based techniques might lead him to be involved with the Lightning God power. He could either be a rival for it or a partner in harnessing its strength.
One interesting plot idea could be the Lightning God power being passed down in an unexpected way. Maybe a character who was thought to be weak suddenly discovers they have a latent connection to the Lightning God power. They then have to learn to control it while facing challenges from enemies who want to steal this power for themselves.
Sasuke would also make a great main character. Given his affinity for lightning - based jutsus, he could be drawn to the Lightning God Slayer powers. He might see it as a way to become even more powerful and seek revenge on his enemies. His journey to master these powers could be filled with self - discovery and moral dilemmas.
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.
One idea could be a story where the protagonist, inspired by the Lightning God Slayer concept, develops a new jutsu that can counter the most powerful lightning - based attacks in the Naruto universe. This new jutsu could be a combination of wind and water elements to short - circuit the lightning.
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.