In this fanfiction, the plot could involve Percy getting involved in a power struggle within the new pantheon. He could be seen as an outsider at first, but as he shows his skills and loyalty, he gradually earns the respect of some of the gods or goddesses. He might also meet new allies who are from different mythologies than his own and together they try to bring about some sort of change in the new pantheon's status quo.
It could be a group of rogue entities that are not fully part of the new pantheon but exist on its fringes. They might oppose Percy's presence because they fear he will disrupt the balance that they are trying to manipulate for their own gain.
One idea could be a crossover where Percy meets characters from the Norse pantheon. He could go on an adventure with Thor and Loki, and they have to face a common enemy that threatens both their worlds. Another idea is to have Percy enter the Egyptian pantheon's realm and learn their magic and ways, maybe even form an alliance with Anubis.
You can make it unique by focusing on the relationships between the different pantheons. For instance, show how the gods from the Greek and the Aztec pantheons view concepts like honor and sacrifice differently. Percy could be caught in the middle of these cultural differences and have to find a way to reconcile them.
The story of 'percy joins the hunters fanfiction' could start with Percy being invited to join the Hunters for some special reason. Once he joins, he has to deal with the fact that the Hunters are mostly female and have their own traditions. He may find himself in the middle of internal Hunters' politics. For example, some Hunters might be skeptical about his presence, while others see his potential. His journey within the Hunters could also lead to self - discovery, as he learns more about himself and his place in this new group, all while going on quests and battling against various foes.
In 'percy joins the hunt fanfiction', it could be that Percy joins to find someone or something. He might be on a quest to rescue a friend who has been captured by the creatures that the hunt is targeting. His loyalty to his friends would drive him to take risks and face the unknown challenges of the hunt.
Obviously, Percy is one of the main characters. There might also be the leaders of the hunt, whoever they are in the fanfiction's setting. Maybe there's an experienced hunter who acts as a mentor to Percy during the hunt.
In fanfiction where Percy joins the Avengers, there are numerous possibilities. He might introduce the Avengers to the world of Greek mythology which they may not be very familiar with. His powers over water could be used to put out fires in a different way than Stark's technology. He could also form a bond with Natasha Romanoff, teaching her some of his sneaky combat moves from his demigod training while she could teach him espionage skills. This could create a whole new dynamic within the team.
Well, perhaps Percy could be seeking a new kind of power or a different way to prove himself. He might initially be lured in by the Titans' promises of a more 'free' and unconstrained way of using his abilities. Maybe he gets disillusioned with the Olympians and thinks the Titans offer a better alternative.
One common theme is the fish - out - of - water experience. Percy is used to the world of demigods and suddenly finds himself in a completely different and chaotic place. Another theme is self - discovery. In the chaos, he often has to reevaluate his own powers and identity.