Yes, I recommend "The Dragon and the Swordsman and the Magician". Zeus, Poseidon, and Hades are all characters in this novel. At the same time, it was also a fantasy sword and magic novel. I hope you like this fairy's recommendation. Muah ~😗
To develop Poseidon's character, focus on his connection to the sea. Describe how his moods are like the changing tides. For example, when he's angry, the seas rage. Show his pride in ruling the oceans. For Hades, emphasize his loneliness in the underworld. Maybe he has a longing for something more than just ruling the dead, like a connection to the living world which he can't fully have.
Well, it could focus on the political implications. In Greek mythology, the gods often have power struggles. Their marriage could be a strategic move. Poseidon and Hades might join forces to gain more influence among the other gods. Maybe Zeus would be threatened by their union. This could lead to a series of events where they have to prove their loyalty to each other and their new combined rule while facing opposition from Zeus and his allies.
As 'lemon' fanfiction is not something that should be promoted, we can look at normal Hades and Poseidon fanfiction themes. These may include their part in the creation and governance of the world, and how their personalities clash or complement each other in various mythological events.
One great fanfiction idea could be a story where Zeus, Poseidon and Hades have to team up to face a common threat that is even more powerful than them. Maybe a primordial being awakens and they must put aside their differences. In this story, Percy could be the mediator between them, using his unique position as the son of Poseidon to try and keep the peace among the three powerful gods.
Power dynamics is a common theme. Given that both Poseidon and Hades are powerful gods, how their powers interact in the context of a relationship can be explored. For example, one might write about how they use their powers to protect or impress each other.
One plot idea could be a story where Poseidon and Hades have to team up to save the underworld from a powerful and ancient threat that is endangering both the sea and the realm of the dead. They start off distrusting each other due to their different natures but gradually learn to respect and rely on one another.
Poseidon might be presented as a rather powerless god in the context of Percy being abused in fanfic. Despite being Percy's father, he could be constrained by the will of Zeus and other gods, which prevents him from acting decisively to save Percy. Hades, however, might be a more interesting character. He may have his own motives for helping Percy. He could see Percy as a useful tool against the other Olympians or simply as a victim who he can relate to, given his own outcast status among the gods. So, in fanfic, he might play a key role in Percy's journey to overcome the abuse.
In the development of their relationship, they would also have to deal with family matters. The other gods, like Zeus, might try to interfere. But Poseidon and Hades could stand united. They would have to communicate a lot, about their pasts, their fears, and their hopes for the future. Through these deep conversations, they would form an unbreakable bond. Their marriage would be more than just a union of two powerful gods, but a relationship based on mutual respect, love, and the shared goal of creating a new order in the mythological world.
A fanfiction could be about a competition among Zeus, Poseidon and Hades, and Percy has to be the judge. The competition could be something like who can best help a small, struggling mortal town without using their full power. This would show a different side of the gods and also test Percy's ability to be fair and objective.