Another plotline could involve Percy making a deal with the God of Death. In this scenario, he has to fulfill certain tasks in exchange for something he desperately needs, like saving a friend's life. This would put him in a series of dangerous and morally challenging situations as he tries to complete the tasks without sacrificing his own values.
In some fanfictions, Percy could become the God of Time himself. This would lead to a whole new set of powers and responsibilities. He might have to manage the flow of time, which could include stopping time - thieves or those who try to manipulate time for their own evil purposes. His friends would then have to adjust to this new, all - powerful Percy, and there could be conflicts arising from the change in his status.
The idea of Percy as the God of Space opens up a whole new world of possibilities. For instance, his relationship with other gods would change drastically. Gods like Zeus, who are used to being in control of the sky (which is related to space in a way), might see Percy as a threat or a new ally. Percy's adventures would no longer be just limited to the Earth or the known mythological realms. He could travel to distant galaxies and encounter new and strange creatures, and his demigod nature might be the key to interacting with these extraterrestrial beings.
In fanfiction, if Percy Jackson is the God of Water, his relationships would change. For example, his relationship with Annabeth would be different. There could be a power dynamic shift as he becomes a more powerful entity. She might have to adjust to his new status, and there could be some interesting tension and growth in their relationship.
In some fanfictions, Percy might be sent back in time to a period when the gods were more actively involved in battles. He then has to navigate the complex politics of the time, deal with the more primitive and violent versions of the gods, and use his modern - day knowledge and skills to change the outcome of some crucial battles. This could also lead to him changing the future in unexpected ways, creating a whole new set of challenges for him.
Some fanfictions might explore a plotline where Percy's new status as the God of the Unseen causes a rift between him and his friends. His friends may feel that he's becoming too different or powerful. He could then have to struggle to maintain his relationships while also dealing with the responsibilities of his new role. Additionally, there could be a plot where Percy discovers ancient prophecies related to the God of the Unseen and has to figure out how to fulfill them without sacrificing his own values.
Another plotline could involve the eldest god having a prophecy related to Percy. This prophecy could force Percy to make difficult choices between his loyalty to his friends and his newfound role in the eldest god's plans. For instance, he might have to sacrifice a chance to save a friend in order to fulfill a greater purpose for the world as dictated by the eldest god.
In many fanfictions, a common plotline involves Percy being framed for a crime he didn't commit. He then has to clear his name while also fighting off the real culprits, which are often powerful monsters or devious demigods. Another plotline could be that a new prophecy emerges that only Percy can fulfill, but it puts him in direct conflict with some of his closest friends. Also, there might be a plot where a group of demigods decide to break away from the traditional Camp Half - Blood and form their own community, and Percy has to decide whether to join them or not.
In fanfiction, Percy Jackson as the God of Emotions could be really interesting. He already has a deep well of emotions from his normal adventures. As a god, he might be able to sense and manipulate the emotions of others. For example, he could use his new powers to calm his friends in times of distress or even incite courage in them during battles.
One common plotline is Percy struggling to control his new powers as the God of Chaos. He might accidentally cause chaos in places he doesn't mean to.
Many fanfictions also have a plotline where Percy as the God of Tides has to deal with the consequences of his new power. He might accidentally cause a natural disaster due to his inexperience with his godly abilities. Then, he has to find a way to fix it while also facing the wrath of the other gods who are angry about the disruption he has caused.