In a married relationship, they'd have to deal with daily life. Percy might introduce Calypso to modern human things like movies and pizza, while Calypso could show Percy more about her island's unique culture. This exchange of cultures and experiences would deepen their bond.
Their relationship could develop through shared experiences. For example, they might go on a quest together to find a lost relic. During this quest, they learn more about each other's strengths and weaknesses and grow closer.
At first, Calypso might be in awe of Percy's new godly form. But soon, they realize that they are equals in many ways. Their relationship develops as they face opposition from some of the other gods. They support each other through difficult times, like when some try to undermine their marriage. Percy, with his courage, and Calypso, with her wisdom, make their relationship strong and they become a power couple in the divine realm.
It can be developed through communication. For example, Percy could write letters to Calypso (even if she's on her island). These letters could express his true feelings for her, and Calypso could respond in some magical way. This exchange of thoughts and emotions would deepen their relationship.
In some fanfictions, their interactions are filled with a bit of tension. Calypso, having been alone for so long, may be hesitant to fully trust Percy at first. But as he continues to visit her and bring her lemons, she slowly warms up. They start to share stories, with Percy telling her about his adventures at Camp Half - Blood and Calypso sharing her knowledge of the island's secrets. Their relationship builds over time, and the lemons can be seen as a symbol of their growing bond.
One character that would be really good to include is Circe. She has her own island and magic, and her interaction with Calypso could be fascinating. She might be jealous of Calypso's new relationship or try to use it to her advantage. Poseidon could also be included. As Percy's father, he might have an opinion on Percy's connection with Calypso. And finally, Thalia. She could be the voice of reason for Percy, helping him figure out his feelings and what to do about his relationship with Calypso.
Often, they start with Percy arriving on Calypso's island. Then, they begin to understand each other. For example, in many fanfics, Percy tells Calypso about his adventures, and she shares her loneliness. This mutual understanding forms the basis of their relationship.
Percy would likely become more mature. He has already been through a lot, but the relationship with Calypso would force him to think about a more permanent future. He might become more patient as well, as Calypso has her own traumas from being alone for so long. Calypso, on the other hand, would become more open. She has been isolated, but with Percy, she starts to trust more and interact with the outside world again. Her powers might also develop in new ways as she has a new purpose in life - to be with Percy and build a future together.
In Percy Jackson x Calypso fanfic, their relationship is often complex. Calypso is a character with a tragic past, being trapped on her island. Percy, on the other hand, is a hero. Their interactions can range from a sense of mutual understanding to a more romantic undertone. The fanfic might explore how Percy's heroism affects Calypso and how she, in turn, changes his view of the world. It could also delve into the idea of forbidden love, as Percy has other obligations and relationships in the original story.
Perhaps their relationship becomes more of a friendship based on mutual understanding. Percy has had his own share of being in difficult situations, and Calypso has been alone for a long time. When they meet again, they might share their feelings and experiences, which deepens their connection and makes their relationship more than just a memory of their past encounter.
Maybe they start a family in a hidden part of the world. Percy could teach their children about his demigod skills and Calypso could pass on her knowledge of nature and magic. It would be a story full of family adventures and protecting their new life together.
In many Percy Jackson fanfictions, Calypso is often portrayed as a complex and tragic figure. She's shown as being both alluring and lonely. Her character is usually depicted with her longing for Percy, as in the original books. Some fanfictions might explore her life on the island before Percy arrived, giving more depth to her isolation.