One common theme could be the struggle for power. In these fanfics, Percy might be abused as a way to show how the power dynamics among Poseidon, Hades, and the other characters are out of balance. For example, if Poseidon or Hades sees Percy as a threat to their realm, they may abuse him to keep him in check. Another theme could be redemption. Percy, after being abused, might strive to find a way to make things right and gain the respect of the gods again. It could also explore the theme of family. Since Percy is related to Poseidon, the abuse could be a way to show the complex and often strained relationships within the family of the gods.
Well, a frequent theme is the exploration of the nature of the gods. In these fanfics where Percy is abused, it can show that even though the gods like Poseidon and Hades are powerful, they are not without their flaws. The abuse might be a result of their pride or jealousy. For instance, if Percy shows great potential, Hades might abuse him out of envy. Also, the theme of survival is often there. Percy has to endure the abuse and find a way to survive in a world full of powerful and sometimes cruel deities. And sometimes, the theme of friendship can play a role. His friends might try to help him get out of the situation of abuse, highlighting the importance of loyalty among them.
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.
Poseidon could play a regretful father. He may realize too late how much Percy has suffered and then try to make amends. For instance, he might secretly send gifts or powers to Percy to help him defend himself. Hades could be a secret mentor. He has a lot of knowledge about the dark side of the world and magic that could help Percy understand his situation better and find ways to fight back against his abusers.
A common theme is power inheritance. Since Percy is Poseidon's son, many fanfics explore how he comes to terms with his godly powers and his connection to Poseidon's domain. For example, in some, Percy has to master new abilities that are passed down from Poseidon.
Writers can start by developing strong characters. For Percy, they need to show his vulnerability as well as his inner strength. For example, they can write about how he copes with the abuse internally while still showing some defiance on the outside. For Poseidon and Hades, they should give them complex motives for the abuse. Maybe Poseidon is being pressured by other gods and takes it out on Percy, or Hades has some long - standing grudge against Percy's family. They can also create a vivid setting. A dark and foreboding Underworld for Hades' part of the story, or a stormy and unpredictable sea for Poseidon's influence. This can enhance the mood of the abuse and Percy's struggle.
One common theme is power discovery. Since Percy is Poseidon's son, many fanfics explore Percy finding out new powers he inherits from his father. Another theme is family bonds. They dig deeper into the father - son relationship between Percy and Poseidon which was not fully explored in the original series.
One common theme is family. Since Percy is the son of Poseidon and Amphitrite is Poseidon's wife, it often explores how Percy fits into this new family structure. Another theme is power. Percy already has his own powers from Poseidon, and Amphitrite being a goddess also has great power, so how their powers interact is often explored.
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.
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.
A common theme is the exploration of Percy's heritage. Since Poseidon is his father, many fanfics dig deeper into what that means for Percy, like how he can access more of his godly powers. For example, some fanfics have Percy learning to control the tides in ways he hadn't before.
Family is a big theme. Since Poseidon is adopting Percy, it's about creating a new family unit. It shows how Percy, who has often felt like an outcast, now has a powerful and loving father figure in Poseidon. Another theme could be power. With Poseidon as his father, Percy may gain new insights into his powers and how to use them more effectively.