I'm not sure specifically as it depends on the fanfic. But it could be an adventurous space pilot as one of the main characters.
Often in such fanfics, you might find a strong - willed explorer as a main character. This person is not afraid to venture into the unknown, across the stars and through the fields of different planets. There could also be a sidekick character, like a mechanic who is really good at fixing the spaceship during the long journey. And sometimes, there might be a mysterious figure that the main character encounters during their travels, who has their own motives and secrets related to the stars and fields.
One interesting plot idea could be a journey across different star systems in search of a long - lost civilization. Another could be the discovery of a new type of energy in the fields of an alien planet that changes the balance of power in the galaxy.
I'm not sure specifically which Elysian Fields Fanfic you're referring to, as there could be many. But generally, it might feature characters from the original source material that inspired the fanfic. Or it could introduce entirely new characters created by the fanfic author. For example, it could have a protagonist who is on a quest to understand the mysteries of the Elysian Fields.
I'm not sure specifically as there are countless 'across the time fanfic' out there. It could be the main characters from the original work that the fanfic is based on. For example, if it's a fanfic based on 'Doctor Who', the Doctor could be one of the main characters as he is already associated with time - travel.
There could also be original characters created by the fanfic writer. These might be characters like a young and talented choreographer who comes in to help the stars with their routines. Or a mysterious figure who has a hidden agenda related to the outcome of the competition.
I'm not sure specifically as it depends on the fanfic. It could be a young wizard or witch as the main character who is drawn to the magic in the stars.
The main characters might be leaders within Harad who are trying to bring about change. Or it could be a group of outcasts who end up being the key to Harad's salvation. There could also be mysterious characters with special powers that are native to Harad.
There might be other characters who are friends or allies of the 'child of the stars'. They could be from different backgrounds, like a group of adventurers who team up with the 'child of the stars' to face various challenges. These characters would add depth and variety to the story.
Often, the main protagonists are popular to write about. Their established personalities and story arcs provide a great foundation for fanfiction. For example, if there's a heroic lead in 'across the stars', many fans like to expand on their adventures or explore their inner thoughts. Also, the villain characters can be interesting to write about. You can give them more depth, like exploring their motives for being evil or creating a backstory that makes them more sympathetic. Another popular choice might be the sidekick characters. They usually have a unique relationship with the main character and fans might want to explore what they do when they're not by the main character's side.
There's no way to know exactly without reading it, but likely there are pirate characters. There might be a brave and fearless pirate as the protagonist, perhaps with a sidekick or a love interest. And there could be an antagonist, another pirate or a figure from the outside world who opposes the main characters' beliefs about the stars - written destiny.
Then there's a wise old wizard called Merlin. He guides Alex with his vast knowledge and magic skills. There is also a female character, Lily, who is strong - willed and has her own special abilities. She often comes up with creative solutions when they are in trouble.