Isolation can be a theme too. Percy might feel isolated in the mortal world as he no longer has the same connection to the demigod world. He may feel like an outsider. Additionally, the theme of self - discovery is present. As he experiences life as a mortal, he discovers new aspects of himself, like hidden talents or interests that were overshadowed by his demigod life.
One common theme is the clash of different power systems. Percy Jackson has its own set of powers related to Greek mythology, and Mortal Kombat has its martial arts - based combat and magic. Another theme could be the exploration of new alliances. For instance, characters from both universes might team up against a common enemy.
One common theme is friendship. It shows how the mortal friends and Percy stick together through thick and thin. For example, in many fanfictions, the mortal friends are there to support Percy during his toughest battles. Another theme is the discovery of the mythological world. Mortal friends often start out clueless and then gradually learn about all the gods and monsters.
One common theme is the discovery of a new world. The mortal OC often stumbles into the world of demigods and has to learn about it. Another theme is friendship. As the mortal OC gets to know Percy and other demigods, they form strong bonds. For example, in many stories, the mortal OC starts as an outsider but gradually becomes an important part of the group through friendship.
One common theme is the fish - out - of - water experience. The mortal character is suddenly thrust into a world of demigods, magic, and monsters, so they have to adapt quickly. Another theme is the discovery of one's own strength. Even though they are mortal, they often find ways to be useful and brave in the face of danger. Also, the theme of friendship is prominent as they form bonds with the demigods.
One common theme is the discovery of the demigod world by mortals. Mortals often find themselves in the middle of this strange and dangerous world they didn't know existed before.
One common theme is friendship. Despite the harem aspect, the relationships often start as friendships. Another theme is adventure. Just like in the original Percy Jackson series, the fanfictions usually involve quests and battles.
Another theme is loyalty. The loyalty between Percy and Blackjack is unwavering, and fanfictions like to highlight this. For example, there are stories where Blackjack stays by Percy's side even in the most dangerous of situations, and Percy in turn does everything he can to protect Blackjack.
Common themes in 'Percy is a loner' fanfiction include the idea of independence. Percy has to fend for himself, which makes him more independent. There's also the theme of mystery. Because he's a loner, other characters might not know much about him, creating an air of mystery. Additionally, the theme of friendship in a different context. Sometimes, the fanfiction shows how Percy forms unique and deep friendships even though he's a loner. For example, he might meet someone who also feels like an outsider, and they form a special bond that is different from normal friendships.
One common theme is isolation. When Percy is betrayed, he often feels alone and has to face challenges by himself.
The exploration of the mythological world is also a major theme. Writers might create new mythological creatures or expand on the existing ones. They could also introduce new areas within the realms of the gods, like a hidden part of Mount Olympus.