Since I don't know the exact 'naruto gravewalker fanfiction', it's hard to say for sure. But it could feature Naruto himself as a main character, perhaps he discovers the world of the gravewalker. Or it could be an original character created for this fanfiction who is the central 'gravewalker' figure.
The main characters could be a group. There could be the gravewalker, who is the central figure with their unique abilities and goals related to the graves. Then, some of Naruto's friends might be drawn into the story. For instance, Shikamaru could be involved due to his intelligence and his ability to analyze situations. He might help the gravewalker figure out the mysteries of the dead. And Hinata could also be part of it, perhaps her gentle nature could play a role in dealing with the more spiritual aspects of the story.
Often, the Gravewalker themselves is a main character. They usually have a mysterious past and special abilities. There could also be characters from the original Game of Thrones series who interact with the Gravewalker. For example, Jon Snow might cross paths with the Gravewalker and they could form an alliance or be at odds. Daenerys could also be involved, perhaps seeing the Gravewalker as a threat to her claim to the Iron Throne.
The Gravewalker is obviously a main character. They are the central figure around which the story revolves. Then there could be Harry Potter himself. Since it's a fanfiction set in the Harry Potter universe, Harry might interact with the Gravewalker, either as an ally or an adversary. Hermione and Ron could also be involved, depending on how the story is crafted.
I'm not entirely sure specifically what 'naruto gravewalker fanfiction' is about as there could be many different interpretations. It might be a fan - made story where the characters in Naruto are involved in some sort of adventure related to graveyards or the undead. Maybe it's about a character who walks among graves and discovers secrets or has special powers in that context.
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.