The theme of loyalty also pops up frequently. Percy has to decide where his loyalties lie - with his newfound heritage related to Nyx, with his old friends from Camp Half - Blood, or with the gods who now view him with suspicion. Fanfictions explore how he navigates these complex loyalty issues.
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 popular 'Percy son of Nyx fanfiction' is 'Percy, Son of Nyx: A New Destiny'. It takes Percy on a journey where his heritage as Nyx's son gives him unique powers and challenges. He has to navigate a world that is both in awe and fearful of his newfound identity.
Developing his powers further is also a way. Since he's the son of Nyx, he could learn to manipulate different aspects of darkness like creating illusions using shadows or traveling through the dark realms faster. This would not only make him more powerful but also show his growth as a character as he masters these new abilities.
One common theme is the struggle with identity. Since Percy is the son of Erebus and Nyx in these fanfictions, he often has to grapple with being different from the 'canon' Percy. Another theme is power. Given his new parentage, he might have different or enhanced powers, and the fanfictions often explore how he uses or controls them.
The Titans could be antagonists. Since Nyx is an ancient and powerful goddess, the Titans might see Percy as a threat because of his connection to her. They could try to either turn him against Nyx or simply eliminate him.
Another plotline could involve Percy exploring the powers he has inherited from Chaos and Nyx. Maybe he discovers unique abilities that no one has ever seen before, like the power to manipulate shadows in a way that's different from a child of Hades. This could lead to him going on a journey to understand the full extent of his powers and how to control them.
One idea could be Percy having to face a new type of monster that is related to Nyx's powers. For example, a shadow - creature that can only be defeated by using the unique abilities he inherits from being the son of Nyx.
One idea could be Percy's struggle with his new identity as Nyx's adopted son. He might face discrimination from some of the other demigods who are suspicious of his new connection. Another plot could involve Percy learning new powers from Nyx that set him apart in battles against monsters. He could also have to deal with Nyx's enemies who target him because of his relation to her.
Well, obviously Percy himself. Since he is the son of Chaos and Nyx in this fanfiction, he is the central figure. Annabeth is often included too. Her relationship with Percy, whether it's evolving or being tested due to his new status, is a key aspect. There could also be other demigods like Grover. He might be there to support Percy or be a bit wary of his new powers.