One common trait is curiosity. Since Percy has such a mysterious life, his mortal friends are usually curious about his comings and goings. Another is loyalty. Even when they don't fully understand what's going on, they stand by Percy. For example, they might cover for him when he has to disappear suddenly for a quest.
Many of Percy's mortal friends in fanfiction are often depicted as being quite perceptive. They can sense that there's something different about Percy, even if they can't put their finger on it right away. Also, they tend to be brave in their own way. When they do find out about Percy's world, instead of running away, they might offer their support, like helping him research some mythological creature that has shown up in their town.
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.
Well, in fanfiction, Percy as a gangster might often display a sense of leadership. Since he was a natural leader in the original stories, this could translate into him leading his gang. He could also have a rebellious streak that makes him stand out. This rebelliousness might be what led him into the gangster life in the first place. And, his physical abilities from the original series, like his speed and strength, could be enhanced to make him a formidable figure in the gangster underworld. He might use his skills to protect his territory or his gang members. For example, his ability to fight with a sword could be turned into a unique fighting style in the gangster - themed fanfiction.
Percy's mortal friends in fanfiction can serve various purposes. They are often used to show Percy's connection to the mortal world he is supposed to protect. They might be characters that Percy confides in to some extent, even if he has to hold back some of the more dangerous details. In some fanfictions, his mortal friends could also be the target of villains who want to get to Percy through them, creating a whole new set of challenges and storylines.
When Percy's mortal friends first meet Annabeth in fanfiction, it could be in a busy place like a park or a coffee shop. Percy's friends would likely be struck by Annabeth's beauty and intelligence. However, they would also sense her wariness. Annabeth, on the other hand, would be cautious about revealing too much to these mortals at first. As they start to talk, the friends might ask her about her relationship with Percy, and Annabeth would have to be careful with her answers to protect their world of demigods from being exposed.
One common trait is unreliability. Like in the story I mentioned before, a useless friend might not show up when they are supposed to or not do what they promised. For example, if they said they would pick you up from the airport and then just forget about it.
Often, she is strong - willed. As the daughter of Hera, she has a sense of pride and determination. She may be very protective of family, which could extend to the demigods she befriends. In many fanfics, she also has a certain grace about her, almost regal, similar to how Hera is often depicted.
One common trait is enhanced combat skills. Since he is the God of War, he would be expected to be an even more formidable fighter. Another trait could be a more aggressive and assertive personality, as war often demands such qualities.
Well, a likely trait would be a sense of superiority. As the God of Pride, Percy in fanfic might look down on others. He may not tolerate any form of disrespect towards himself and might react harshly. Also, he could be very possessive about his powers and status. He would want everyone to recognize his greatness and might go to great lengths to prove it. In some fanfictions, this could lead to conflicts with other characters who don't accept his new role so easily.
Often, male OCs in Percy Jackson fanfiction are brave. Since the world of Percy Jackson is full of danger, they need to be brave to face monsters and challenges. For example, they might bravely stand up against a Minotaur or other mythical beasts.
A sleepover with Percy and his mortal friends could be full of fun and adventure. They might share spooky stories, like Percy telling tales from his demigod experiences that make his friends' jaws drop. Maybe they play some crazy games that only Percy could introduce, like a modified version of Capture the Flag using his powers in a safe way.