Obviously, Percy would be one of the main characters. He's the one doing the singing. The gods themselves, like Zeus, Poseidon, and Athena, would also be important characters as they are the recipients of Percy's song.
In the fanfiction, Percy might sing to the gods as a way of expressing his own internal struggles. He could be feeling lost or confused, and the act of singing to the gods is his way of seeking guidance. He might pour out his heart about his identity as a demigod, his relationship with his father Poseidon, and his place in the world of the gods and mortals.
I'm not entirely sure specifically what 'percy sings fanfiction' is about without more context. It could potentially be a project where someone named Percy sings stories based on fan - created fictional universes.
Percy in 'percy sings fanfic' could be a local singer or an amateur performer who decided to take on the interesting task of singing fanfic. Maybe it's a stage name, or it could be someone within a small community of fans who is known for this unique activity. Without more context, it's difficult to say for sure who this Percy is.
Probably Poseidon, as he is Percy's father and has a vested interest in his son's well - being. Zeus might also be protective in some cases, despite their past differences, as Percy is a hero who often saves the world which benefits Zeus's realm as well.
Well, without reading the specific fanfiction, it's hard to say exactly who Percy is. But generally, in a 'champion of the gods' scenario, Percy would be a central figure. He might be a hero with unique powers, like being able to control certain elements or having superhuman strength. He could be a character who has to face various challenges and tasks on behalf of the gods, kind of like a chosen one in a fantasy story.
Zeus is a possibility. As the king of the gods, he might see Percy's potential and adopt him to have an ally among the demigods. Another could be Poseidon, since Percy is already his son in the original story. It would be an interesting twist to have Poseidon formally adopt Percy in a more divine way.
The gods might show their protection in various ways. For example, they could directly intervene in battles Percy is in, using their divine powers to shield him from harm. They might also send him signs or omens to guide him away from danger.
Zeus is often one of the main gods showing possessiveness. He sees Percy as a powerful asset or a potential threat, so he wants to keep Percy in check. Poseidon, as Percy's father, also shows possessiveness in a different way. He wants to protect Percy but also use his powers for his own purposes sometimes.