Yes, there are some great ones out there. You can start by looking on fanfiction websites like Archive of Our Own. Just search for 'Percy Jackson is a mortal hunter' and you'll find a variety of stories with different takes on the concept. Some might focus on Percy's new role as a mortal hunter, how he adapts to it, and the challenges he faces in this different world compared to his demigod adventures.
Luke Castellan could also be seen as one of the strongest mortals in fanfiction. He was a very skilled swordsman and had a lot of charisma which he used to lead others. Even though he made some bad choices, his abilities were formidable.
In Percy Jackson fanfiction, one factor that makes a mortal strong is their knowledge. For example, if a mortal has in - depth knowledge about Greek mythology, they can use that to their advantage. They might be able to predict the actions of monsters or demigods based on the myths. Also, physical combat skills are important. Mortals who are trained in martial arts or sword - fighting can hold their own against some threats.
Percy's character development in this fanfiction might start with a sense of loss. Losing his demigod status means losing a big part of his identity. He may become more humble as he realizes the challenges that mortals face every day. As he adapts to mortal life, he could become more self - reliant in different ways, like having to earn money for the first time or deal with normal school problems without relying on his powers.
In 'Percy Jackson is a mortal fanfiction', perhaps an interesting concept is how Percy's mortal life affects his view of the demigod world. He might start to question the fairness of the demigod existence now that he's on the outside looking in. Also, the fanfiction could explore how Percy's mortal family reacts to his newfound mortality. Do they notice a change in him? And how does he explain his past adventures without revealing the truth of the demigod world?
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.
I really like 'Percy in the Mortal High School Hierarchy'. In this fanfiction, Percy has to navigate the complex social structure of high school. It shows how his experiences as a demigod both help and hinder him in this new setting. For example, his combat skills make him a force to be reckoned with in gym class, but his ADHD makes it hard for him to focus in some academic classes.
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.
A powerful sorcerer who has escaped from Tartarus and wants to use the chaos of the mortal world to regain his strength. He could be targeting Percy because Percy's presence in the mortal world disrupts his plans of secretly gathering power.
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.