Jason is likely to be another main character. Since he has his own set of skills and knowledge, he might have an interesting relationship with Percy in this story. Maybe he's a bit jealous at first of Percy's control over the ship, but then they end up working together really well. And of course, Piper could be there too. She might use her charm - speak abilities to help the crew communicate with any strange creatures they encounter during Percy's time controlling the Argo 2.
The main characters are clearly Percy and Annabeth. Percy, the son of Poseidon, is known for his courage and his ability to control water. Annabeth, the daughter of Athena, is highly intelligent and strategic.
It could be that Percy's control of the Argo 2 is a result of some new power he has gained. This new power might attract the attention of both friends and foes. His friends might be in awe and a bit worried about this new development, while his enemies might see it as a threat. So, there could be a lot of political intrigue and battles as different parties try to either support Percy or take his newfound power away from him. And all of this while he is trying to use the Argo 2 to reach their ultimate destination.
Percy in 'percy controls poison fanfiction' could be a character that the fanfiction author has designed with unique abilities related to controlling poison. Maybe it's someone inspired by a real - life figure, a historical character perhaps, but more likely it's a fictional creation within the realm of the fanfiction. It could also be that Percy is a character borrowed from a popular book, movie, or game series, and the fanfiction writer has given them this new role of controlling poison for the purposes of their story.
In this fanfiction, Percy is the main one in control. But characters like Chiron, the centaur mentor, would also play a significant role. Chiron has a wealth of knowledge and experience, and Percy would likely rely on him for advice on matters of the camp's history and traditions. Also, there could be some antagonist characters within the camp who don't like Percy's new rules and ways of controlling, which would add some conflict and drama to the story.
Percy could be an original character created by the fanfiction author for this specific story. Or he might be a character borrowed from another work, like Percy Jackson perhaps, and given this new 'controls all elements' ability in the fanfiction world.
Another possible main character could be a rival. A person who is always competing with Percy and who might use the discovery of her secret as a weapon against her. This would add a lot of conflict to the story.
Annabeth could be a main character. She might be trying to stop Percy from wanting to die. She could use her intelligence and her deep understanding of Percy to figure out what's wrong and try to talk him out of it. For example, she could remind him of all the good things they've been through together and all the people who need him.
There could be a strict but kind music teacher. This teacher sees Percy's potential and pushes him to practice harder and improve his skills. Another character could be Percy's best friend who is always there to support him during his musical journey, even when things get tough.
Grover could also be a main character. He could use his nature - related abilities to assist Percy when he wields the Blades of Chaos. For instance, he might be able to sense danger in the environment that Percy can then use the blades to face. Grover could also help Percy find his way in places where the Blades of Chaos' power might be affected by the surrounding nature.
There could be an old Alaskan native who becomes Percy's guide. He has a wealth of knowledge about the land and its spirits. He helps Percy understand the ways of the Alaskan wilderness.