One interesting plotline could be a power struggle between Triton and Percy, with Poseidon caught in the middle. Maybe Triton feels threatened by Percy's newfound status as a demigod son of Poseidon and tries to undermine him.
Triton is often an interesting character in these fanfictions. He has his own insecurities and ambitions. Some fanfictions write him as a jealous character, feeling overshadowed by Percy. But in other well - written ones, he is shown as a complex figure who has his own reasons for his actions and eventually comes to terms with Percy. His knowledge of the sea and his relationship with Poseidon also offer a lot of potential for character development.
One idea could be Percy exploring an underwater realm that only Poseidon can access. He discovers ancient secrets about his father's past and the origin of his powers. Another could be a story where Percy has to team up with Poseidon to fight a new and powerful sea - born enemy. Maybe there's a prophecy that only their combined strength can fulfill.
One common theme is power discovery. Since Percy is Poseidon's son, many fanfics explore Percy finding out new powers he inherits from his father. Another theme is family bonds. They dig deeper into the father - son relationship between Percy and Poseidon which was not fully explored in the original series.
To start a 'Percy Jackson x Poseidon fanfiction', begin with a strong opening scene. Maybe it's Percy having a vivid dream about Poseidon that hints at something important. Then, introduce the main problem or adventure. You could also do some research on Greek mythology related to Poseidon to add more depth to your story. Don't forget to give Percy his characteristic personality traits like his loyalty and courage. And build up the relationship between Percy and Poseidon gradually, perhaps starting with some misunderstandings and then leading to a deeper understanding.
One possible plotline could be Percy facing a new and extremely powerful sea monster that Poseidon can't directly interfere with, but through their unique father - son bond, Poseidon gives Percy hidden powers that help him in the fight. Another could be Percy exploring an ancient underwater kingdom that Poseidon has long kept secret, and there are many challenges and revelations along the way.
Obviously, Percy Jackson and Poseidon are the main characters. Percy, as the demigod son of Poseidon, has his own set of powers and a complex personality. He's brave and often impulsive. Poseidon, on the other hand, is a powerful god of the sea with his own motives and a sense of fatherly love towards Percy, which is often explored in these fanfictions.
One reason could be that Triton realizes Percy is a key figure in the grand scheme of things. Percy's actions have far - reaching consequences for the balance of power in the mythological world. Triton, as a figure in this world, is affected by these changes. He might cry for Percy because he sees Percy as a symbol of hope or a potential savior. And yet, he also knows the great burden that Percy has to carry, which makes him sad.
There's a fanfic called 'Under the Sea's Embrace: Percy and Poseidon'. In this fanfic, the author focuses on the emotional aspect of their relationship. Percy discovers new powers related to his father Poseidon and they go on a journey together to understand these powers better. It has some really interesting character development for both Percy and Poseidon.
Another theme is the impact on their son Percy. Writers often explore how the relationship between Sally and Poseidon has influenced Percy's life, his powers, and his own understanding of love and family. For example, some fanfictions show Percy having a deeper connection to the sea because of his parents' relationship.