First, know the original Percy story well. This gives you a base to build on. Then, think of a unique concept like 'What if Percy had a different power?'. Outline your story with a beginning, middle, and end. For example, start with Percy facing a new problem, develop the plot in the middle with his attempts to solve it, and end with a resolution. Also, create interesting new characters or expand on existing ones.
When writing Percy Serious Fanfiction, begin with brainstorming ideas. You could think about how Percy would react in different situations, like a political intrigue in his world. Then, start writing your draft. Don't worry too much about grammar at first. Focus on getting the story out. After that, revise your work. Check for consistency in your characters and plot. Add details to make the world more vivid. For example, describe the magical places Percy visits in great detail. You can also get feedback from other fans to improve your story.
To write Percy Serious Fanfiction, start by choosing a theme. It could be something like 'Percy in a post - apocalyptic world'. Do research on relevant topics if needed. Next, develop your characters. Give Percy new traits or relationships. For the plot, make it engaging. Have some twists and turns. For instance, if Percy is on a journey, let there be unexpected obstacles. Write in a style that suits the mood of your story, whether it's fast - paced or more contemplative.