Since it's a 'lost son' story, the main character is likely to be the son himself. But without reading the fanfic, it's hard to say exactly who he is or what his backstory is.
It could be a previously unknown son of Luke Skywalker. Maybe he was hidden away for some reason and now he's lost in the galaxy, trying to find his father or his place among the Jedi.
Well, 'the lost son star wars fanfic' might focus on a son who has been separated from his family in the Star Wars setting. It could be that he's lost in terms of his allegiance, not sure whether to side with the Jedi or the Sith. He might be on a quest to discover his roots and in the process, face many challenges like battles, moral dilemmas, and dealing with different alien species.
Obviously, the son of Abeloth would be a main character. There might also be some Jedi or Sith characters who interact with him.
The Son of Abeloth is the central figure. Alongside him, there could be an old and wise Jedi Master who senses the potential in the Son of Abeloth, either for great good or great evil. There might also be a Sith apprentice who sees the Son of Abeloth as a threat or a tool for his own rise to power. And don't forget about the smugglers or bounty hunters who might get caught up in the events surrounding the Son of Abeloth, either by accident or for a hefty reward.
Thane Kyrell and Ciena Ree are the main characters. Thane is a character who ends up on the side of the Rebellion, and Ciena is a strong - willed woman who stays loyal to the Empire. Their different paths and their relationship form a major part of the story.
Well, it could be about a son who gets separated from his family in the Star Wars universe. Maybe he's a Jedi or Sith in training and gets lost during a battle or a mission. He then has to find his way back, facing all sorts of challenges and meeting new characters along the way.
The main character could be a padawan who was orphaned during a Sith attack. This padawan has always had a strong connection to the light side but has been struggling to fully embrace it due to the trauma. Through the story, they learn to 'let the light in' and become a powerful Jedi.
Darth Vader could be the main character in a second - chance fanfic. He could be brought back to life and given the chance to fully embrace the light side from the start. He could use his knowledge of the dark side to help the Jedi fight against a new and powerful evil in the galaxy.
Another option could be a hybrid character. Maybe a half - Dark Angel, half - Star Wars species character. This character would be constantly torn between the two sides of their heritage, having to decide whether to embrace their Dark Angel side, which might be more about physical strength and survival, or their Star Wars side, which could involve the moral choices related to the Force.
I'm not entirely sure as I haven't read it in detail, but it probably has some characters who are either on the side of the Rebellion or the Empire.