One interesting plot could be Nico's journey to fully understand and control his powers in a new way that wasn't explored in the original books. Maybe he discovers a hidden aspect of his underworld powers that helps him save Percy from a new and powerful enemy. Another plot could involve Percy and Nico teaming up to explore a forgotten part of the mythological world, like a lost island full of ancient monsters and forgotten gods. It could be filled with action - packed battles and the discovery of new magical items.
In some fanfiction, there are plots where Percy and Nico have to deal with a rift in the demigod world that's causing chaos. They might have to travel between different camps and convince the other demigods to work together. This could involve them facing internal conflicts within the camps as well, like rivalries between different cabins. Also, a plot could be centered around Nico's past and how it starts to surface in unexpected ways, affecting his relationship with Percy and the others.
Well, there are fanfictions with plots where Percy and Nico get transported to an alternate dimension. In this new place, the rules of the mythological world are different. They have to figure out how to get back while also dealing with the strange new creatures and powers there. Some fanfictions also explore the idea of Nico having a love interest, and how that affects his friendship with Percy and his role in the demigod community.
One interesting plot could be Percy and Nico going on a magical adventure together in a world full of mythical creatures that are only known in ancient Greek tales. They might have to solve puzzles and face challenges to save this world.
One interesting Nico Percy Jackson fanfiction could be those that explore their friendship in more depth. For example, stories where they go on a secret quest together that the main series doesn't cover. It gives a chance to see their characters interact without the main plot constraints.
One interesting plotline could be Nico and Percy teaming up to face a new, powerful monster that neither of them could defeat alone. Their combined powers and different perspectives make for an exciting adventure.
One interesting character could be a punk - inspired Annabeth. She might have a new, edgier side to her personality, like being more into street - smart strategies. Another could be a punk version of Grover, with a really cool and rebellious attitude towards the nature spirits. And there might be some original characters created in the fanfiction, like a punk demigod who has a unique power related to music or graffiti.
One idea could be a school competition where Percy and Nico have to team up against other demigods. They could use their unique powers in unexpected ways to win, like Percy using his water control to create cool water sculptures as part of an art contest, and Nico summoning shadowy creatures for a drama performance.
One interesting plot could be a competition between them for a powerful magical artifact. Percy uses his water - based powers, Jason his lightning and flight, and Nico his control over the dead to outwit each other in a race to find it.
In some fanfictions, Percy and Nico could be rivals in high school. Maybe for the position of the captain of the school's myth - based club. This rivalry could lead to some intense moments where they both try to outdo each other in knowledge about the Greek gods and their powers. Eventually, they realize that their combined knowledge and skills can make the club even better.
Another plot could involve the Earthshaker being awakened accidentally. This causes chaos not only on Earth but also in the Underworld. Percy and his companions need to travel to different realms, including the Underworld, to figure out how to put the Earthshaker back to sleep. They encounter different gods and goddesses during their quest, and some might help while others might try to hinder them.
A cool plot could be a time - travel fanfiction. The Minotaur travels back in time to the era when the gods were more actively involved in the mortal world. He could interact with the gods, and Percy has to follow him through time to stop him from causing chaos. This would involve Percy having to deal with different rules and powers in the past, and also understanding the Minotaur's motives for going back in time.
One interesting plot could be where the NPU (assuming it's some new power or entity in the Percy Jackson universe) is a key to unlocking an ancient prophecy that no one knew existed. Percy and his friends have to figure out how to use the NPU to their advantage while also dealing with the usual monsters and gods trying to stop them.