In fanfiction, Percy's move to San Francisco could bring new relationships. He could meet a girl who is also a demigod but has been hiding her identity. They start as friends but soon realize they have a special connection. Also, his relationship with his old friends might change. Some might visit him, and they have to adjust to the new environment together. He may also have new enemies. There could be a group of powerful witches in the city who see Percy as a threat to their plans of ruling the magical underworld of San Francisco.
Well, he might encounter new mythological creatures unique to the San Francisco area. Maybe there are sea monsters in the bay that he has to deal with, just like in his previous adventures but with a local twist.
The setting of San Francisco can add a lot of mystery. With its foggy weather, it can be a great place for monsters to hide. Also, the city's many hills and old buildings can be like a maze for Percy to navigate, making it more exciting when he's on a quest.
His life would change drastically. He'd be living in a different environment, like the Batcave perhaps. He'd have to adapt to Batman's strict rules and training regime.
Percy's daily life would be different. Instead of going to Camp Half - Blood on land, he might attend an Atlantean school for demigods or those with special abilities. He would also have to adapt to the Atlantean diet which could be very different from what he's used to. And his friends would likely be a mix of Atlanteans and other demigods who have also made their way to Atlantis.
If Percy becomes a werewolf in fanfiction, his social life would be turned upside down. His friends at Camp Half - Blood might be hesitant to be around him, fearing his new, more unpredictable nature. He might be drawn to other werewolves or creatures of the night, which could introduce him to a whole new set of allies and enemies. Also, his training as a demigod would need to be adjusted to account for his werewolf abilities, like learning to fight in his new form without losing control.
His social circle would expand. He'd meet new people in the music industry, from producers to fellow singers. His daily routine would shift from demigod training to rehearsals and recording sessions.
He'd probably have a different set of enemies. In Ancient Greece, the threats might be more centered around the local myths and power struggles. For example, he could be in the middle of a feud between two powerful city - states, each with their own godly patrons.
His life would change drastically. He would be a being of immense power. He would no longer have to fear the wrath of the Olympians as he would be on a similar or even higher level. He could shape the world as he wished.
One popular plotline could be Percy exploring the hidden magical spots in San Francisco. For example, he might discover an ancient Greek relic hidden beneath the Golden Gate Bridge. Another could be him facing off against new monsters that are drawn to the city's unique energy. Maybe there are sea - based monsters emerging from the San Francisco Bay.
His relationship with his old friends from Camp Half - Blood would likely be strained. They might not understand his decision to join the Chaos Army and think he's turned his back on them. However, he could also make new friends within the Chaos Army who share his new goals and values.