There could also be an original character. For example, a young ninja from a small and forgotten village who discovers that they are the chosen one to wield the Lightning God power. This character would then have to navigate the complex world of the Naruto universe while trying to master this great power.
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.
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.
Often, the main character could be an original character created by the fanfiction writer who has a special connection to the crimson lightning. Maybe they are a young ninja trying to prove themselves in the Naruto world.
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, original character could be the main character in a Naruto chains fanfiction. This character could be from a small, unknown ninja village and possess a unique ability to control chains made of some special material. They could come to the Hidden Leaf Village and get involved in the events there, interacting with the well - known Naruto characters.
Obviously Naruto is one of the main characters since it's in the title. And Lightning Farron is likely to be a main character too, as Naruto is supposed to be his son in this fanfiction. There may also be other Naruto - universe characters like Kakashi or Jiraiya who could play important roles in the story.
Naruto himself is likely to be one of the main characters. Since it's a Naruto fanfiction, he would probably play a central role. Maybe he'll be the one who discovers the power of Black Lightning and tries to incorporate it into his own fighting style. Another likely character could be Sasuke. He's always been Naruto's rival, and if Naruto starts using new powers, Sasuke would surely be interested in it too.
Well, of course, Lightning is the main character in most Lightning fanfiction. But often, there are also side characters like his friends or comrades. For example, in some fanfictions, there could be a character named Flash who is Lightning's best friend and they go on adventures together.
It could be Naruto himself. Imagine if he was reborn as a sennin. He would have all his previous experiences and then the added power and wisdom of a sennin, which would make for an extremely powerful and interesting character to follow.
Well, Naruto is the main character by default in 'naruto son of joker fanfiction'. However, other main characters could be the Hokage at that time. The Hokage would be in a difficult position as Naruto is now related to a very different kind of character. Additionally, new characters created specifically for this fanfiction could be main characters. They could be hybrids of Naruto's world and the Joker's world, with unique abilities and personalities that drive the story forward.
Obviously Naruto would be one of the main characters. And since it's about him being the son of Arachne, Arachne herself could be a significant character, either in flashbacks or as some kind of guiding force in Naruto's life. His friends like Sasuke and Sakura would also likely be main characters as they interact with Naruto and are affected by his newfound identity.