A possible plot could involve Percy being cursed by a mysterious force that makes him a target for all monsters. The huntresses decide to protect him as he is an important ally. Along the journey, they come across a monster that is immune to their usual weapons. Percy then uses his wits and knowledge of the underworld to find a way to defeat it. This could lead to a series of adventures where Percy and the huntresses explore new areas, meet strange creatures, and form a stronger bond.
Well, a great plot for this fanfiction could be that Percy discovers a new type of monster that has a connection to the huntresses' past. Maybe it was a monster that was once thought to be extinct but has now returned. The huntresses and Percy then have to research the old tales about this monster to find its weakness. As they dig deeper, they also uncover secrets about the huntresses' order that change their perspective on their own history and mission.
Percy is a central figure. In addition to him, there might be a huntress with special powers, like the ability to communicate with animals. This power could come in handy when they are tracking monsters. There could also be a huntress who is an expert in using a particular type of weapon, say a bow and arrow, and she is known for her amazing marksmanship in battles against the monsters.
One idea could be Percy having to face a new type of monster that is a hybrid of multiple known ones. This would test his skills in new ways.
One idea could be exploring the origin of the Primordial of Monsters in more depth. Maybe there's a hidden prophecy related to it that Percy and his friends have to uncover. Another could be a story where the Primordial of Monsters forms an unexpected alliance with Percy against an even greater threat.
One idea could be Percy having to protect his harem from a new and powerful monster threat that specifically targets them because of their connection to him. Another could be Percy exploring his relationships within the harem while also dealing with his identity as the son of Poseidon in a world full of monsters.
Perhaps a plot where the she - monsters have a special power that only Percy can unlock or control. For instance, they hold the key to a powerful weapon, and Percy has to earn their trust to access it. This would involve Percy going through a series of trials set by the she - monsters.
Well, perhaps Percy is raised by a group of monsters who are actually being controlled by an even more powerful and malevolent force. Percy then has to figure out how to break the control over the monsters that raised him and turn them into allies. He could start having strange dreams or visions that give him clues about his true heritage and his purpose in this situation. And as he grows up, he starts to notice differences between himself and the monsters, which makes him question everything he's been taught.
One plot idea could be a new super monster arriving at the school. This new monster has a unique power that the others have never seen before. It could create some chaos at first as the other super monsters try to figure out how to get along with this new addition. Another idea is a time - traveling adventure where the super monsters go back in time to meet their ancestors and learn about their own powers' origins. And a third idea might be a mystery where the super monsters' powers start to disappear one by one, and they have to work together to find out what's causing it.
One idea could be Percy having to face a new type of monster that is a combination of all the previous ones he's fought. This super - monster could be created by an ancient and powerful enemy who wants to truly become the king of monsters. Another plot could involve Percy having to enter the realm of the dead to find a weapon that can defeat the king of monsters. Maybe he has to make a deal with Hades to get this weapon.
One idea could be a crossover between 'Duel Monsters' and a fantasy world like Middle - earth. The characters from 'Duel Monsters' could enter this new world and have to use their dueling skills in unexpected ways, like dueling orcs or goblins instead of other duelists. Another plot could involve a crossover with a superhero universe. Duel Monsters players suddenly find themselves with superpowers related to their decks, and they have to battle super - villains while still using their dueling strategies.
A crossover with a superhero universe would also be cool. Imagine the Monsters University characters suddenly in a world full of superheroes. The monsters' unique abilities could be seen as superpowers in this new world. Sulley's size and strength could make him a formidable force, while Mike's intelligence could be used to outwit villains. They could either team up with the superheroes or find themselves in conflict with them at first due to misunderstandings.