The plot could start with Percy being cursed into the dragon transformation by an enemy. He then has to find a way to break the curse while in this new form. This could lead him on a quest to find a rare magical herb or a powerful spellcaster. Meanwhile, his friends at Camp Half - Blood are worried about him and set out to find him. There could be a lot of action - packed scenes where Percy, in his dragon form, battles various monsters that are after him because of his new and powerful state. Also, there could be some emotional moments where Percy misses his human form and the simple life he had before the transformation.
One plot line could revolve around a prophecy. The prophecy could state that only a dragon - transformed demigod can stop an upcoming great evil. Percy then has to embrace his new form and journey to different mythical places to gather the power or knowledge needed to defeat this evil. Along the way, he faces challenges not only from the forces of evil but also from his own self - doubt about whether he is the right one for the task. He might also meet some new allies who are also part dragon, and together they form a powerful team.
A potential plot line could be that Rory and Percy meet during a cosmic event that disrupts the boundaries between their worlds. They initially have some misunderstandings due to their different backgrounds, but as they start to communicate, they find common ground in their desire to protect their respective worlds. They then embark on a journey to find the source of the disruption and fix it.
One way to write it could be to focus on Percy's connection to the water element and how it might interact with the dragon transformation. For example, perhaps the dragon form has water - based powers like shooting jets of steam from its mouth. You could also explore how Percy's character traits, like his loyalty and courage, are enhanced or changed in the dragon form.
In fanfiction, a frequent plot line is that of a quest. Fem Percy Jackson and Artemis could embark on a quest together. Maybe they are searching for a lost relic that is important to both the demigod world and Artemis' domain. During this quest, they would face various challenges and enemies. Their different personalities - Fem Percy's impulsiveness and Artemis' calculated nature - would either clash or complement each other. Another common plot is the idea of Fem Percy being a chosen one in Artemis' eyes. Artemis sees potential in Fem Percy and decides to train her, which leads to a series of adventures and growth for Fem Percy.
One common plot line could be Percy using his demigod skills in a medical school setting. For example, his quick reflexes might help in emergency situations during practical training. Another could be Percy having to deal with mythological creatures causing medical mysteries in the hospital. Maybe a centaur appears as a patient with an unknown illness that has ties to Greek mythology, and Percy has to figure it out using his knowledge of both worlds.
One potential plot development could be the chaos it would cause among the gods. Artemis being pregnant would shatter her image as a virgin goddess, and there would be a lot of conflict among the deities. Another could be Percy having to face the consequences of his actions, perhaps being hunted by other gods who are angry at his 'transgression'.
Percy as a god could bring new life to the gods' domain. He's always had a different perspective from the traditional gods. He might start new traditions or events among the gods, like a more inclusive council where demigods are also given a voice.
One major problem is the ethical aspect. The Percy Jackson series is aimed at a wide range of audiences, including young readers. Fanfiction with a 'drugged' theme can be inappropriate and send the wrong message. It may also distort the original positive and adventurous nature of the story.
Malefor could be a great antagonist. If Spyro's transformation is related to dark magic, Malefor might try to manipulate Spyro in his new form to serve his evil purposes. He could see Spyro's transformation as an opportunity to turn him against his friends and the Dragon Realms.
The Cyclops Tyson could be an ally. He has a strong bond with Percy and his strength could be a great asset. In a fanfiction where Percy is the God of Light, Tyson could be like a protector of Percy's light - based temples or strongholds. Also, the sea creatures that Percy has befriended over the years might come to his aid. Since Percy has his roots in the sea and now has light powers, they could work together in a unique way, like the sea creatures using their natural abilities to help spread Percy's light across the oceans to keep dark sea - based threats at bay.
Piper could also be a potential love interest in this scenario. Given her charm - speaking abilities, she could either be a rival to Percy in the 'player' game or be someone he tries to charm. Their interactions would be filled with a mix of friendly banter and underlying romantic tension.