The Furies could also be major antagonists. They are already powerful and feared in the Underworld, and Percy as the Champion of Erebus might be seen as a threat to their authority. They could try to undermine him at every turn, setting up traps and sending various minions after him. Additionally, there could be a new, unknown force emerging from the darkest parts of Erebus that is opposed to Percy's role. This could be a primordial being that has been awakened by Percy's ascension and wants to return the Underworld to a more chaotic and lawless state.
One plot idea could be Percy having to face a series of trials in the Underworld to prove himself as the Champion of Erebus. Maybe he has to retrieve a powerful artifact that was lost in the darkest corners of the Underworld, and along the way he encounters old foes and makes new, unexpected allies among the dead. Another idea is that as the Champion, he has to mediate a power struggle between different factions of the Underworld, like the Furies and the shades. This would put his diplomatic skills to the test as much as his combat abilities.
One common theme is identity. Percy has to figure out who he is now that he's the son of Erebus. Another theme is power. His new heritage often comes with new and different powers that he has to learn to control. For example, in many fanfictions, he might have powers related to the underworld like shadow manipulation.
The theme of identity is also quite prevalent. Being the son of such powerful and somewhat mysterious entities, Percy might struggle with his own identity. Is he more like his father, Erebus, associated with darkness and shadow, or his mother, Nyx, the night? Fanfictions often play with this idea, showing his journey to understand who he is and where he fits in the grand scheme of the mythological universe.
One great Percy son of Erebus fanfiction is 'The Dark Journey of Percy'. It explores Percy's new identity as the son of Erebus and his struggle to fit into a world that views him differently. Another is 'Percy: Son of Shadows' which delves deep into his new powers and how he uses them to protect those he loves.
There's also 'Female Percy: A New Heroine'. Here, Female Percy brings a fresh perspective to the story. Her fighting style is different, more fluid perhaps. And her relationships with the gods are also unique. Instead of the typical male bravado, she uses her wits and charm to get through tough situations.
No. Percy Jackson is a series that is based on Greek mythology, not Roman fanfiction. The books follow Percy, a demigod son of Poseidon, in a world filled with Greek gods, monsters, and quests related to Greek mythology.
Well, it depends on the specific fanfiction. There are countless fanfictions out there, and some authors might choose to reimagine Percy Jackson as a demon for the sake of a unique and edgy story. But the traditional view of Percy is that of a demigod with his own set of powers and adventures that have nothing to do with being a demon.