In Sally and Poseidon fanfiction, a prevalent theme is the exploration of identity. Sally has to come to terms with being in a relationship with a god and how that changes her sense of self. Poseidon also may face changes in his identity as he gets involved with a mortal. Another common theme is the idea of destiny. Whether their relationship is fated or not is often explored. And the theme of secrecy is there too, as they may have to keep their relationship a secret from certain parties in both the mortal and divine worlds.
Common themes in Sally and Poseidon fanfiction include the power of love. Their love is often portrayed as something so strong that it can bridge the gap between mortals and gods. Adventure is also a theme, as they embark on various quests or journeys together. Additionally, the theme of sacrifice pops up. Sometimes either Sally or Poseidon has to sacrifice something important for the sake of their relationship, like Poseidon sacrificing some of his power or Sally leaving her mortal life behind.
Maybe Sally is a sailor who gets lost at sea. Poseidon, noticing her plight, rescues her. In the 'fanfiction', Sally could be someone with a special power that Poseidon is interested in. For example, she might be able to communicate with sea animals in a unique way. They then embark on a journey to find a lost treasure in the ocean that is said to have the power to control the tides. As they search, they learn more about each other and their respective worlds.
Well, it could be a story full of adventure. Poseidon, being a powerful god, might have to go on a quest to protect Sally and their unborn baby from other forces in the mythological world. Enemies could be jealous of the union or want to use the baby for their own purposes. Sally, on the other hand, could be using her own wits and courage, despite being pregnant, to help Poseidon in their journey.
One common theme is family. Since Sally is Percy's mother, a lot of fanfictions explore their family bond, like how Sally protects and guides Percy. Another theme is sacrifice. Sally often sacrifices for Percy in these stories. For example, she might put herself in danger to save him. Love is also a big theme. It can be Sally's motherly love or Percy's love and respect for his mother.
One of the themes is transformation. In many fanfictions, Lemon might transform in some way due to its interaction with Poseidon. Maybe it gains some power or a new understanding. Also, the theme of power dynamics is present. Poseidon has great power, and how that affects his relationship with Lemon is often explored in different ways.
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.
If Poseidon stayed with Sally, their relationship could have deepened and faced challenges from both the mortal and immortal worlds. It might have also influenced Sally's perception of the supernatural and her place in it.
The main characters are obviously Sally and Poseidon. Sally could be an ordinary person from the human world, while Poseidon is the powerful god of the sea in Greek mythology.
Often, there is a theme of growth and change. Jack and Sally's characters might develop further as they take on the role of parents. Their relationship with each other also evolves in the context of raising a child. And sometimes, there is a theme of discovery, as they discover new things about themselves and their world through their baby.
One common theme is the overcoming of obstacles. There are often external factors like social differences or family disapproval that they have to deal with before they can kiss. Another theme is the discovery of true love. Their kiss is often the moment when they realize that their feelings for each other are deeper than they thought.
One common theme is friendship. Their relationship is often explored in terms of how they are there for each other through thick and thin.