I'm not sure specifically as it depends on the particular fanfiction. But it could be an adventurous space explorer. Someone who is brave and curious enough to venture into the unknown regions filled with the dust of the stars.
Often in such fanfictions, there might be a scientist as one of the main characters. This scientist could be studying the properties of the star - dust. They might be trying to unlock its secrets for the betterment of their civilization or just out of pure scientific curiosity. There could also be a rogue pilot who gets caught up in the mystery of the star - dust while on some other mission.
I don't know for sure, as I haven't read the book. But it could have a protagonist who is an adventurer exploring the star - filled regions where stars are like dust.
Peter is obviously one of the main characters since the story is centered around him turning to dust. His friends could also be main characters as they are likely to be involved in the events that follow his transformation.
It depends on the specific fanfiction. However, there could be a young wizard or witch who discovers their connection to the stars and becomes the central character. Maybe there's also an old sage - like figure who guides them in understanding the star - magic.
Perhaps the main character is a star - child, someone born under special circumstances related to the stars and has an innate connection to their magic. Alongside the star - child, there could be friends or protectors, like a skilled warrior who defends the star - child as they explore the full potential of the magic of the stars.
I'm not entirely sure as it depends on the specific fanfiction. But usually, there are protagonists who drive the story forward. It could be a heroic figure with special abilities.
It's also possible that some minor characters from the original Titanic story are given more prominence. Say, the ship's cook who now has to figure out how to feed a crew in space. Or a stoker who becomes an important part of the ship's energy production system for the long journey among the stars.
There's no way to be certain about the main characters without actually reading the 'unsphere the stars fanfiction'. However, if we consider common tropes in fanfiction, it could be a hero who discovers a long - lost prophecy about 'unsphering the stars' and feels compelled to fulfill it. This hero could be an underdog, someone not expected to succeed. There might also be antagonists who oppose the idea of 'unsphering the stars' for their own self - serving reasons, such as a power - hungry dictator who fears the changes it will bring to the power balance in the universe.
I'm not sure specifically as it depends on the fanfiction. But it could be a group of space explorers.
It's hard to say without reading it, but it could be an intrepid space explorer. Someone who is brave and curious, always eager to find out more about the stars.
Not having read the 'grey among the stars fanfiction', it's difficult to name the main characters precisely. But in a typical space - themed fanfiction, we might expect to see a captain of a starship, responsible for the crew and the mission. There could be a tech - savvy engineer who is constantly fixing the ship's systems. And perhaps a mysterious figure who has some connection to the 'grey' that is at the heart of the story, and their identity and motives are gradually revealed as the story unfolds.