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.
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.
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.
Since it's a fanfiction, it probably still features Harry Potter as one of the main characters. He is the central figure in most Harry Potter - related stories. Hermione Granger might also be a main character, as she is Harry's close friend and often plays an important role in the story's progression. Ron Weasley could be another main character, especially if the fanfiction focuses on their trio friendship.
Since it's a Naruto fanfiction, Naruto himself is likely to be one of the main characters. But it could also have other important characters like Sasuke, Sakura, Kakashi, etc. depending on how the story is crafted. Maybe there are also some original characters created by the fanfiction author.
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.
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'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.
I don't know as I haven't read the novel, but I assume there would be Alpha as a main character. There might also be characters who are either friends or foes to Alpha during his or her journey.
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.