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.
The relationship between Percy and Calypso is full of potential. In a 'percy x calypso lemon fanfic', the exploration of their romantic and physical connection can be really engaging. The 'lemon' aspect often adds an extra layer of intensity to their relationship, showing a more passionate side of their story.
The theme of second chances pops up a lot. Since Percy left Calypso once, many fanfictions explore the idea of giving their relationship a second chance. Another is the power of the gods. The gods' influence on their relationship, whether it's Zeus' curse on Calypso or Poseidon's influence on Percy, is a recurring theme. And finally, the theme of sacrifice. There are instances where either Percy or Calypso has to sacrifice something for the other, like Calypso sacrificing her chance at freedom for Percy or Percy sacrificing his own desires for the greater good which affects their relationship.
In the fanfiction, perhaps there are misunderstandings between Percy and Calypso. Maybe she blames Percy for things he didn't do or vice versa. These constant misunderstandings can lead to Percy hating her.
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.
It might be that in the fanfiction, Calypso represents something that Percy has come to dislike. Maybe she is associated with a force or an idea that Percy opposes, like a form of confinement if she tries to keep him on the island in a more extreme way than in the original tales.
One common theme is redemption. Calypso has been through a lot, and in fanfiction, Percy often plays a role in her redemption or finding a new purpose in life. For example, in many stories, he helps her see the world outside her island in a new light.
One common theme is longing. Calypso is often depicted as longing for Percy after he leaves her island. Another theme is sacrifice. Percy may have to sacrifice his own desires or plans to be with Calypso. For example, in some fanfictions, he has to give up his quests to stay with her.
You can try searching on popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you might be able to find some 'percy x calypso lemon fanfic' there. Just use the search function and type in the relevant tags.
One great Percy and Calypso fanfiction is 'Calypso's Redemption'. It delves into Calypso's feelings after Percy leaves and how she tries to find her place in the world again. Another is 'Percy and Calypso: A New Beginning' which imagines a scenario where they meet again under different circumstances. There's also 'Calypso's Choice' that shows her internal struggle regarding her love for Percy and her own freedom.