One common theme is forbidden love. Since Percy and Persephone come from different 'worlds' in a sense, their relationship can be seen as something that goes against the norm. Another theme is adventure, where they might go on quests together in the Underworld or other realms.
A prevalent theme is the power dynamic. Percy has his own set of powers as a demigod, and Persephone has her power in the Underworld. Fanfics often explore how they interact with each other's power. Also, the theme of redemption can be found, where Percy might help Persephone with some aspect of her life in the Underworld, or vice versa.
A common theme is the clash of different worlds. Percy comes from the world of the demigods and Persephone from the realm of the gods. Their interaction often involves navigating these differences. For example, in many stories, Percy has to adjust to the more formal and ancient ways of Persephone's world.
Yes, there are many. You can start by looking on popular fanfic websites like Archive of Our Own. Just search for 'Percy x Persephone' and you'll find a variety of stories, ranging from romantic adventures to more angsty takes on their relationship.
One common theme could be the use of lemon as a symbol of purification or a magical ingredient in a story involving Persephone's realm. Maybe Percy Jackson stumbles upon a situation where lemon is crucial in some sort of underworld - related task. Another theme might be Persephone's relationship with the mortal world (where Percy is from) and how lemon, as something from the mortal world, plays a role in that connection.
One common theme is friendship development. Since Will and Nico come from different backgrounds within the Percy Jackson universe, their friendship evolving into something more can be a central plot point. For example, they might start off not understanding each other but gradually grow closer.
The theme of family dynamics often plays a role too. Persephone's pregnancy might bring her family, like Demeter (her mother), into the story in different ways. There could be tension, reconciliation, or new alliances formed as a result of her pregnancy. Also, the idea of how the new family - Persephone, Hades, and their unborn child - will fit into the existing mythological power structure can be an interesting aspect of the fanfiction.
One common theme is identity. Percy has to figure out who he is now that he's the son of Isis instead of Poseidon. Another theme is power. He has to learn about and control his new powers. And relationships are also a big theme. How does he interact with his old friends from the Poseidon side, and how does he make new friends in the Isis - related world?
One common theme is loyalty. Both Percy and Thaila are known for their loyalty in the original stories, and this can be explored further in the fanfics, especially when dealing with werewolf packs. Another theme could be the struggle between human and werewolf nature, as Percy may have to come to terms with Thaila's werewolf side or vice versa.
One common theme is the exploration of different forms of love. Since Percy is the god of love, fanfics often look at how he deals with romantic love, platonic love, and love for all living things. For example, in some fanfics, Percy has to help two friends realize their platonic love for each other.
Another theme is adventure. Fans love to send Percy and Thalia on new quests. These could be in search of lost artifacts or to defeat new and powerful enemies. It gives the characters a chance to show their skills and grow. For instance, in some fanfics they might travel to unknown realms within the demigod world. And often, these adventures are full of twists and turns that keep the readers hooked.
One common theme is the struggle with identity. Since Percy is the son of Artemis, who is a virgin goddess, his very existence challenges the norms of Greek mythology. He has to figure out where he fits in the world of demigods and gods.