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.
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.
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.
Well, perhaps Percy goes to San Francisco to explore its famous landmarks like the Golden Gate Bridge. He might meet new friends or encounter some challenges specific to the city.
Perhaps Percy will meet a group of environmentalists. Given San Francisco's reputation for being environmentally conscious, they could be fighting against some sort of sea - related pollution that Percy gets involved in. He might use his powers and knowledge to assist them, and in the process, make some good friends.
One popular San Francisco detective novel is 'The Maltese Falcon' by Dashiell Hammett. It features the iconic detective Sam Spade in the seedy underworld of San Francisco.
In many fanfictions, a common plotline involves Percy being framed for a crime he didn't commit. He then has to clear his name while also fighting off the real culprits, which are often powerful monsters or devious demigods. Another plotline could be that a new prophecy emerges that only Percy can fulfill, but it puts him in direct conflict with some of his closest friends. Also, there might be a plot where a group of demigods decide to break away from the traditional Camp Half - Blood and form their own community, and Percy has to decide whether to join them or not.
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.
Perhaps there's a special event in San Francisco that Annabeth wants Percy to be a part of. It could be a celebration, a reunion of some sort, or an opportunity for them to have some time away from their usual troubles and just enjoy each other's company in a new and exciting city.
One popular plotline is Percy's journey in his new role as the Brother of Chaos. He might have to face powerful enemies that are a threat to the new order he's a part of. Another common plot could be his interactions with other characters from the Percy Jackson universe. They may react with shock or awe to his new status. Also, his training under Chaos to master new powers is often explored in fanfiction.
In the fanfiction, they could meet up with some of Annabeth's friends in San Francisco. Percy would probably be a bit out of place at first, but with Annabeth by his side, he'd soon warm up. They could end up having a great time at a local café, chatting and just enjoying each other's company while sipping on some coffee.