Another theme is pride. Poseidon is proud of Percy's heroic deeds, and Percy in turn is proud to be the son of Poseidon. This mutual pride is expressed in a very affectionate way in many of the fluff fanfictions, like Poseidon publicly showing his support for Percy's actions in the demigod world.
One common theme is family. These fanfictions often explore the father - son relationship between Percy and Poseidon, showing how they grow closer and understand each other better.
One common theme is family bonding. Since Poseidon is Percy's father, stories often focus on how they build a relationship despite the challenges. Another theme is protection. Poseidon is a powerful god, and he's usually depicted as protecting Percy from all sorts of danger in these fictions.
One common theme is the father - son relationship. Since Percy is Poseidon's son, a lot of fanfictions explore how they interact and support each other.
One great piece of fanfiction is 'A Father - Son Moment' which beautifully captures the bond between Percy and Poseidon. It has heartwarming scenes of them interacting at Poseidon's underwater palace.
One common theme is identity. Since Percy has two very different divine parents, he often struggles to figure out who he really is in fanfictions. Another theme is power. With the combined powers of Lupa and Poseidon, his power levels and how he uses them are often explored. Also, acceptance by his peers is a big theme as they may view his dual heritage as strange or overpowering.
The theme of power and its consequences is often explored. As Poseidon's daughter, she has great power over the sea. But in fanfiction, she has to learn how to control it and use it responsibly. Some fanfictions also explore the theme of love, whether it's romantic love or the love for her friends and the camp, which can be a driving force in her character development.
Well, a frequent theme is conflict. There's the internal conflict within Percy himself as he grapples with his dual heritage. Externally, there could be conflict with other characters who might view him differently due to his being the son of Gaea, a force that has been at odds with the demigods before. Also, themes of redemption can be present. Percy might feel the need to prove that he's not a threat like Gaea was, despite his connection to her.
The theme of destiny is also quite common. There are often prophecies or fates that Percy and Poseidon are tied to. It could be saving the world from a great evil or fulfilling an ancient obligation. Additionally, loyalty is a theme. Percy's loyalty to his father and vice versa is explored in many stories, especially when faced with difficult choices.
One common theme is the exploration of forbidden love. Given their relationship in the original stories, a romantic relationship between them would be considered unconventional in that world. Another theme could be self - discovery, as Percy might have to come to terms with new feelings that he didn't expect towards Poseidon.
One common theme is the discovery of family. Percy often gets to know more about his father, Poseidon, and they bond over shared family traits and history.
One common theme is the exploration of power. Since Poseidon is a powerful god and Percy has his own powers as his son, fanfictions often play with how this power dynamic affects their relationship, whether it's a struggle for control or a sharing of power.