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.
A new character could be introduced as the main character. Maybe a young ninja from a small, unknown village who discovers they have an innate ability related to the Lightning God Slayer. They then travel to the major ninja villages in the Naruto world to learn more about their power and how to use it for good, all while facing the challenges of being an outsider.
Sasuke could be a great main character. Given his natural affinity for fire - based jutsu in the Naruto series, the addition of Fire God Slayer powers could make him even more formidable. He could use these new powers to seek revenge in a different way or to protect the village in a more powerful capacity.
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.
It could be a new student at Hogwarts who has the powers of a Lightning Devil Slayer. This character would be an outcast at first, not fitting in with the normal wizarding students. But as the story progresses, they use their unique abilities to save the day, for example, during a battle against a horde of Dementors where their lightning - based powers are especially effective.
Perhaps an ancient evil that has been sealed away for centuries but has now found a way to use the concept of the Death God to break free. This entity was once a powerful ninja who turned to dark magic and now wants revenge on the modern ninja world. It could be a very powerful foe for Naruto as it has knowledge of old and forgotten jutsus.
The dragon god itself could be the main antagonist. Given its power and the threat it poses to the Naruto universe, it would be a natural choice. It could be a being that wants to destroy the ninja world or enslave it for its own purposes.
Maybe it's Naruto himself with an additional power - up. Imagine Naruto gaining the godlike lightning ability on top of his existing powers. He would be even more formidable and could use the lightning in combination with his shadow clones and Rasengan techniques. This would change the dynamics of his battles and relationships with other characters like Sasuke, who also has powerful lightning - based attacks.
It could be an existing character like Naruto who, through some strange turn of events, gains the Wood Dragon Slayer power. This would completely change his fighting style and how he approaches challenges. He could use the power in creative ways, like combining it with his Rasengan to create a new, more powerful attack.
Hermione Granger could also be a great choice as the main character. She is extremely intelligent and studious. In a fanfiction with god - slayer magic, she could be the one to discover and decipher the secrets of this new form of magic. She might use her knowledge to not only master it but also to teach others and lead the fight against any god - related danger.
Well, Naruto is most likely one of the main characters since it's in the title. There may also be other characters from the Naruto series like Sasuke or Sakura. And if it's about a lightning dragon slayer, there could be new characters introduced, perhaps a mentor - like figure who teaches Naruto about slaying lightning dragons.
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.