Well, 'percy' might refer to a character. 'Ancient' could imply that the fanfic is old - perhaps it was written a long time ago or is set in an ancient time period. Fanfic, of course, is short for fan fiction, which is a story written by fans based on existing works.
It could be a modern - day villain who wants to use the power of the ancient heroes for his own evil purposes. He might be jealous of Percy's connection to the ancient heroes and try to stop him at every turn.
Perhaps Percy could be transported back in time to the era of the ancient heroes. There, he meets the heroes he has always idolized and has to team up with them to face a common enemy. This would allow for some great character interactions and development.
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.
Well, a cool plot might be Percy getting lost in time and ending up in Ancient Greece during the Trojan War. He could then have to figure out how to get back to his own time while also getting involved in the events of the war. Maybe he tries to change the outcome of the war, but realizes that doing so could have disastrous consequences for the future. Or perhaps he discovers that there's a secret reason why he was sent back in time, like to retrieve an important artifact that was lost during the war.
He could have adventures like battling mythical creatures. For example, fighting the Minotaur in the labyrinth. Maybe he'd also encounter the gods and goddesses and get involved in their power struggles.
Well, in many fanfics, Percy might be depicted as having a conflicted relationship with bloodbending. He could be shown as initially reluctant to use such a powerful and somewhat dark ability.
Percy is likely a main character in this fanfic. Without more context, it's hard to say exactly who he is, but he could be a character with unique abilities or a special role within the story's world. Maybe he's a hero or an anti - hero.
I'm not sure which specific 'Percy God of Sex' fanfic you're referring to. There could be many interpretations of a character named Percy in different fan - created stories. It might be an original character created by the fanfic writer with their own unique backstory and characteristics within the context of that particular fanfic.
Without more context from the fanfic itself, it's difficult to say exactly who Percy is. He could be an original character created for this fanfic, or he could be a character borrowed from an existing story universe and given a new role in this particular fanfic.