Well, Naruto is obviously one of the main characters. He's the protagonist of the Naruto series, and in the fanfiction involving Lucifuge, he's likely to be at the center of the story, dealing with the new elements related to Lucifuge. And then there's Lucifuge itself, which is the new and mysterious element introduced into the Naruto universe in this fanfiction. It could be a character with its own motives and powers.
Another possible main character could be Sakura. She might be involved in the story in different ways. Maybe she helps Naruto understand the implications of Lucifuge's presence. Or perhaps she has her own encounter with the powers related to Lucifuge. Her medical skills could also be relevant if there are any battles or injuries related to the new powers introduced by Lucifuge in the fanfiction.
He could betray Naruto to Orochimaru. Orochimaru is always looking for powerful allies and new test subjects. Lucifuge might be lured by Orochimaru's promises of power and knowledge. Orochimaru could use Lucifuge to get closer to Naruto in order to steal the Nine - Tails' chakra or some other valuable asset.
One interesting Naruto Lucifuge fanfiction could be about Naruto somehow getting in touch with Lucifuge's powers and how he uses them in the Naruto universe. Maybe he uses these new powers to face stronger enemies in a unique way.
In a Naruto Lucifuge betrayed fanfiction, the betrayal could be part of a much larger conspiracy. Lucifuge might be under the control of a powerful dark force. He betrays Naruto not out of his own will, but because he is being manipulated. This could lead to a journey for Naruto to not only stop Lucifuge but also to find a way to free him from the control of this dark force. Naruto would have to face his own feelings of trust and friendship being broken while also trying to save his friend from the clutches of evil.
Kankuro is another possible main character. He's a puppeteer from the Sand village. Fanfiction might delve into his growth as a ninja, his relationships with his siblings, or his development of new puppet techniques.
Obviously Naruto is one of the main characters. Given the title, he has a significant connection to the Juubi in this fanfiction.
Obviously, Naruto himself is a main character as the story revolves around his revival. His friends like Sasuke, Sakura, and Kakashi are also likely to be main characters. They would be involved in the process of bringing Naruto back or in helping him adjust to his new life after revival.
Often, there are original characters created specifically for the fanfiction that interact with Damocles and Naruto. These characters could be other ninja from the village, or perhaps outsiders who bring new challenges or perspectives to the story. They might have unique abilities or backstories that tie into the overall plot and help drive the story forward, making the interactions between all the characters more interesting and complex.
Since it's fanfiction, the main characters could be a mix of the original Naruto characters and some new ones created by the author. The formless concept might be centered around a new character who has the power to change the Naruto world in some way, and Naruto and his comrades have to deal with the consequences. Maybe it's a formless being that has some connection to an ancient ninja clan, and Sasuke gets involved in uncovering the mystery.
Obviously, Naruto and Amaru are main characters. Naruto is the well - known protagonist from the original Naruto series, and Amaru is the character specific to the fanfiction who often has her own unique story arc.
Obviously, Naruto and Hippolyta are the main characters. Naruto brings his ninja skills, his strong will, and his experience from the Hidden Leaf Village. Hippolyta, on the other hand, represents the strength and wisdom of the Amazons.