Well, there are several. The theme of forbidden love is quite common. Since Percy has his own life and relationships back in his world, being with Calypso can be seen as something that goes against the norm. Another theme is the power of love to change. Calypso, who has been bitter about her situation, might change because of her love for Percy, and vice versa.
One common theme is the idea of longing. Calypso has been alone for ages, so there's a lot of her longing for connection which Percy can provide. Another is the theme of sacrifice. Percy might have to sacrifice something, like his time in the mortal world, to be with Calypso.
A prevalent theme is the struggle between different worlds. Percy belongs to the demigod world and Calypso is kind of in her own isolated world. Fanfictions often explore how they bridge this gap. Also, the theme of redemption can be seen. Calypso might see Percy as a chance at redemption from her lonely existence.
One common theme is the idea of freedom. Calypso is trapped, and Percy might be the key to her freedom. Another theme could be love against all odds. Given Percy's existing life and Calypso's situation, their relationship is not straightforward. Also, self - discovery can be a theme. As they interact, both Percy and Calypso might learn more about themselves.
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.
One common plotline is Calypso seeking revenge against the gods who trapped her on the island. This gives her a more assertive role compared to the original story. Another is her trying to find a new place in the world of demigods after being freed.
One common theme is the exploration of their relationship. Given their different backgrounds in the Percy Jackson universe, how they interact and grow closer is often a focus. Another theme is adventure. They might go on quests together, which is in line with the overall adventurous spirit of the original series.
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.
Yes, in a lot of cases. Good fanfiction writers manage to flesh out the relationship. They often give more backstory and internal thoughts to both characters. For example, they might describe how Percy is conflicted between his feelings for Calypso and his loyalty to Annabeth. This makes for a very interesting read and shows that the romance in fanfiction can be well - written.
One idea could be that Percy returns to Calypso's island in a dream. They have a long conversation about how they still have feelings for each other despite the distance and the circumstances. Calypso shows Percy a new part of the island that she has created in her loneliness, and they share a tender moment there.
A great plot might involve Percy and Calypso going on a quest to save a group of demigods. Along the way, they face various monsters and challenges, and their relationship deepens as they rely on each other. They could also discover some hidden secrets about the gods during this quest.
One common theme is love and longing. Since Calypso was stuck on the island and had feelings for Percy, many fanfics explore the depth of those feelings and Percy's possible reciprocation. Another theme is adventure. They often go on new adventures together in fanfics.