Well, it could have led to all sorts of adventures and new storylines. Maybe they would have explored more magical places together.
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.
Had Misty remained with Ash, their relationship might have evolved in unexpected ways. Maybe they would have discovered new Pok茅mon together and overcome more significant obstacles, making their journey even more memorable.
Well, it could have led to more adventures and character development for Misty. Maybe she would have had a bigger impact on the plot.
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 could have led to a deeper development of their relationship and more adventures together. Maybe they would have faced tougher challenges and grown even closer as a team.
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.
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.
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 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.
The guests could include Percy's closest friends from Camp Half - Blood. Grover would be there, his presence adding a touch of nature and music. Annabeth would be there to support Percy and also to share in the joy. Some of the younger demigods from the camp who look up to Percy might also be invited. As for Calypso's side, the various nymphs on the island would be present. The talking animals and magical creatures that inhabit the island would also be part of the wedding. And perhaps some of the friendly sea - creatures that Percy has befriended over the years would come to the surface to witness the event.