In a 'Percy Jackson Closes the Doors of Death' fanfiction, Percy may start by gathering information from different mythical beings. He travels to various places in the underworld, from the River Styx to the darkest pits. His powers might be tested to their limits as he tries to overcome the magic and power that keeps the Doors of Death open. There could be a race against time as the chaos from the open doors spreads across the mortal and divine worlds, and Percy has to find a way to close them before it's too late.
Well, it could involve Percy facing numerous challenges in the underworld. Maybe he has to battle new and powerful monsters that guard the Doors of Death. He might also get some unexpected help from his friends, like Annabeth using her wisdom to figure out the secrets of closing the doors. And there could be a final showdown with some major villain who doesn't want the doors to be closed.
The plot might revolve around Percy's journey to find the keys or mechanisms to close the Doors of Death. He could be guided by some prophetic dreams. Along the way, he discovers that closing the doors requires a great sacrifice. So, he has to decide whether he's willing to make that sacrifice for the greater good of the world. It could also involve some complex relationships with the gods who have their own interests in the matter.
It could be an ancient and powerful Titan who escaped from Tartarus when the Doors of Death started to malfunction. This Titan wants to keep the doors open to bring back all the old enemies of the gods and take over the world again.
Maybe a group of rogue demigods who have been corrupted by dark magic. They believe that by keeping the Doors of Death open, they can gain immortality or unlimited power. Percy would then have to face his own kind in order to close the Doors.
One idea could be Percy having to face his inner demons while closing the Doors of Death. Maybe past failures or losses resurface, adding an emotional depth to the task.
One possible plot could be Percy being chosen as the Horseman of Death due to some ancient prophecy. He might have to travel to the Underworld more often and deal with the spirits there in a new way. Maybe he has to collect the souls of those who are supposed to die but are being held back by dark magic.
One possible plot could be that Percy is tricked into a deadly situation by a new villain who has the power to manipulate the elements. Percy is killed in a massive explosion. But his love for Annabeth and his loyalty to his friends are so strong that his soul doesn't pass on. Annabeth, using her intelligence and her knowledge of ancient magic, figures out a way to reach Percy in the in - between world. With the help of some friendly spirits, she brings Percy back to life, and they then set out to defeat the villain who caused his death.
Nico di Angelo has a strong connection to the Underworld, so he's a prime candidate. He can already communicate with the dead and has some control over the shadows, which are related to death in a way. In fanfiction, he could be further developed to become the Master of Death, perhaps by making a deal with Hades or finding a hidden power within himself.
A great plot could be Percy being sent on a top - secret mission by the army. This mission could be related to some ancient artifact that has military applications but also ties to his demigod world. Along the way, he meets other demigods who are also in the military for various reasons. Together, they have to overcome not only military enemies but also mythical creatures that are after the same artifact.
Well, the plot might start with Percy being sent on a special mission by the gods. They need someone with his quick reflexes and sharp eyesight to be a sniper. Along the way, he has to deal with the moral implications of taking lives from a distance. He might also face challenges in terms of getting the right equipment and training. His friends could be initially skeptical of this new role for him, but as they see him succeed in various battles, they come to accept and rely on his sniper skills.
One possible plot could be Percy using his bike to travel across the country to find and protect other demigods. He could encounter various monsters along the way and use his biker skills, like sharp turns and high - speed maneuvers, to evade them.
One possible plot could be that a powerful enemy, let's say a dark sorcerer, has found a way to use the powers of the Greek gods against the supernatural beings in the Mikaelson universe. Percy Jackson is sent to investigate and ends up getting caught in the middle of the Mikaelson family drama. He has to use his skills as a demigod and his knowledge of Greek mythology to help the Mikaelsons defeat this new threat while also trying to keep his own identity and mission a secret from some of the more untrustworthy members of the family.