Definitely Naruto as he is the central figure in the Naruto series. Firebush, as the namesake of the fanfiction, is also a main character in a sense. Another possible main character could be a new character created specifically for the fanfiction. This new character could be someone who has a prior knowledge of Firebush and its powers, and Naruto has to learn from this character to harness Firebush's potential.
There could be a fanfiction where Firebush is actually a sentient being from a different dimension. In this story, Naruto has to form a bond with Firebush to save both their worlds. Firebush could have its own language and culture that Naruto has to learn about.
In Naruto fanfiction, this might be a character's way of distancing themselves from a certain aspect of the Fire element. For example, if the Firebush represents a powerful fire - based group or ability that has a negative connotation in the fan - created story. The character is saying it's not on them for not being a fan. It could also be related to a political or social stance within the fanfic's unique world - building.
It could signify a break from the norm. In Naruto, fire - based abilities are quite common and often associated with power. So if 'Firebush' is a term for a particular fire - related concept, not being a 'Firebush' means going against the mainstream. Maybe the character is from a different elemental background and doesn't want to conform to the fire - dominated ideology.
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.