Often, there will be an antagonist or a group of antagonists as well. They could be those who oppose the rebuilding of the empire for their own reasons, such as wanting to keep the power structure as it is in the post - empire chaos or having a grudge against the old empire. These antagonists add conflict and drama to the story.
Often, the main characters from the original Avatar series like Aang, Katara, and Zuko are still central in 'Ashes to Ashes' fanfiction. Their growth and new adventures are explored further.
I'm not entirely sure as it can vary depending on the specific fanfiction. But often, it could be the protagonist who has a strong connection to the past events that are being explored.
One interesting concept could be the re - building of the empire in unique ways. For example, the fanfiction might explore how the characters use new technologies or alliances to revive the fallen empire.
I don't know specifically as I haven't read this fanfiction. But if it's related to 'Star Wars Rebels' (assuming SWR stands for that), it could have characters like Ezra Bridger, Kanan Jarrus, Hera Syndulla etc. as main characters if the story follows the general themes of the show.
There might also be some secondary characters from the Marvel universe that play significant roles. For example, Nick Fury could be involved in guiding the Avengers as they try to rise again. Or characters like Doctor Strange might make an appearance to offer his magical expertise in helping the Avengers rebuild and face whatever threats are out there.
The main characters could vary greatly depending on the specific fanfiction. It might be an original character created by the author who is on a quest to rebuild a shattered world. For example, a young hero with a mysterious past that holds the key to rising above the ashes.
Often, there is the phoenix itself, which can be depicted as a majestic and powerful being. There might also be a young hero or heroine who discovers the phoenix ashes and is thrust into an adventure.
I'm not sure specifically as it depends on the particular fanfiction. But usually, there would be a strong leader figure, perhaps a military general or a political leader who guides the empire. There might also be a rebel or an outsider who challenges the status quo of the empire.
Often, there's the powerful Emperor who rules the Dark Empire with an iron fist. His presence is felt throughout the story as he makes crucial decisions for the empire.
There could be a powerful dark lord as a main character. He might be the one ruling the empire with an iron fist.