The main character is Amethyst. However, depending on how the fanfic is written, there could be some minor characters that are affected by Amethyst's actions. Maybe there are some small creatures on the planet who are trying to escape or fight back in their own ways. And then there are the core characters from the SU series who are involved in either preventing or dealing with the aftermath of Amethyst's planet - eating.
Well, it could be a really wild and imaginative plot. Maybe Amethyst has some strange power or is under a spell that makes her uncontrollably hungry for the entire planet. It might be a story about the chaos that ensues as she starts consuming the planet bit by bit, and the other characters' attempts to stop her.
In some Planet Blue fanfics, there could be a group of rebels who are fighting against an oppressive regime on the planet. These characters would add a lot of drama and action to the story. Each of them might have their own backstories and motives for joining the rebellion, which makes the story more complex and interesting.
There's no way to know exactly without reading it. However, in a story about an amethyst, there could be a character who is a collector of precious stones. This character might be the main character, or it could be a secondary character who sets the story in motion by bringing the amethyst to the attention of the other characters. There could also be a character from a different culture who has a special connection to the amethyst based on their cultural beliefs.
I don't know as I haven't read the novel. It could be a young adventurer, a wise old sage, or a magical being.
There could be other characters who are trying to stop Chara from eating the human. Maybe a group of friends or family of the human, or some sort of protectors in the world of the fanfic. They would play a crucial role in trying to prevent the dark act from happening.
In the 'the night eats the world novel', the primary character is a man. He is an ordinary person who wakes up to a nightmare. He has no special powers, just his wits and whatever resources he can find in his building. While we don't really get to know many other characters in great detail, as the story is mainly about his solitary struggle for survival. He is constantly facing the challenges of the new world on his own, and his character development is about how he copes with this new, terrifying reality.
Well, Naruto is obviously one of the main characters since it's in the title. He's the one doing all the eating. There might also be his friends like Sasuke and Sakura. Sasuke could be annoyed by Naruto's eating habits, while Sakura might be worried about the effects of all that eating on Naruto's health.
In many 'Planet Jackson' fanfiction, Jackson himself is the central figure. But there could be other important characters as well. For example, a local guide on 'Planet Jackson' who helps Jackson understand the planet's secrets and mysteries. Or perhaps a rival from Earth who also ends up on the planet and tries to compete with Jackson for resources or power. There could also be a group of rebels on the planet who Jackson either joins or opposes, depending on the plot of the fanfiction.
Well, there could be a little mouse. Since Alice is shrunk, the mouse could be her guide in this new, small world. It might show her where to find food or shelter.
The main characters are Pearl and Amethyst. In the context of this fanfiction, they will be at the center of the action. Their relationship, their individual growth, and how they deal with the concepts of sins and harmony will be the main elements of the story. Maybe other characters from their original story will also be involved, but Pearl and Amethyst will be the stars of this fan - created tale.