The plot could develop by introducing a character who challenges Percy's decision. For example, a new girl who is not deterred by his 'no - love' stance and slowly makes him question his own beliefs. This would create an interesting dynamic as Percy tries to resist but finds himself drawn to her.
The plot could also take a darker turn. Perhaps there is a curse that makes Percy believe he has to stay away from love to protect those around him. As the story unfolds, he has to figure out how to break the curse while also dealing with his growing feelings for someone. This would add an element of mystery and suspense to the fanfiction.
Another reason might be that he wants to focus on other things. Percy has a lot going on in his life, like dealing with monsters and saving the world. Love could be a distraction from his important tasks, so he decides to swear it off.
A possible plot could be that Percy is wrongly accused of a crime in the demigod world. To clear his name, he has to go undercover as an assassin. He is hired by an unknown entity to take out certain targets, who are actually involved in a conspiracy against him. As he delves deeper into the job, he discovers the real mastermind behind everything and has to use his assassin skills to expose the truth and prove his innocence.
Percy could start to form new relationships within the Faunus community. These relationships could teach him different values and ways of life. Maybe he'd meet a Faunus mentor who would help him understand and control his new Faunus powers, if he has them. This would be a big part of his development, as he'd be learning from a completely different perspective than he's used to at Camp Half - Blood.
One way it could be developed is by having Hera, in a very un - Hera - like way, be charmed by Percy's courage. Maybe Percy saves her from some new, unexpected threat that even the goddess of marriage can't handle on her own. This would make her see him in a new light, and from there, a reluctant friendship could start that slowly turns into something more.
Developing his powers further is also a way. Since he's the son of Nyx, he could learn to manipulate different aspects of darkness like creating illusions using shadows or traveling through the dark realms faster. This would not only make him more powerful but also show his growth as a character as he masters these new abilities.
For Percy, his loyalty and sense of adventure can be emphasized. He could be the one to initiate contact with Elsa, seeing her as a new and exciting mystery. His skills in combat and his ability to think on his feet would come in handy when they face challenges together. For Elsa, her growth from a withdrawn and fearful queen to someone more open and trusting can be shown. Meeting Percy, who is so different from the people in her world, could be a catalyst for this change.
To develop characters interestingly in a Pokemon harem fanfiction, you can explore their fears. Maybe a certain Pokemon in the harem is terrified of water because of a past incident. The main character then has to help it overcome this fear. This process of facing and conquering fears can make the character grow. Another aspect is their cultural or species - specific traits. A Pokemon from a certain region might have unique customs or abilities. Incorporating these into their character development, like how they interact with the main character based on these traits, can make them really stand out.
Percy could be developed by facing moral dilemmas. For example, when dealing with the eldest Titan, he has to decide whether to trust this ancient and powerful being. This forces him to grow and think more deeply about right and wrong.
Well, it could start with mutual respect. For example, Percy respects Artemis's power and her role as a goddess. Artemis, in turn, could come to respect Percy's courage and his ability to survive against all odds. They could then start to work together on small tasks, like protecting a particular area from monsters. As they spend more time together, they might start to trust each other more, and their relationship could grow deeper.
Percy's development could involve him using his skills in a new way. For example, his ability to control water could be combined with Elsa's ice in creative ways. This would make him more adaptable. Elsa could develop by seeing Percy's loyalty to his friends and trying to form deeper connections herself. As they interact more, they could influence each other's values. Percy might become more patient like Elsa, and Elsa could become more bold like Percy.