Well, it could be about Percy facing some new and unique challenges while training in isolation. Maybe he discovers a new power within himself during this alone time. He could be training to master a new weapon or combat style, like learning to fight with a double - edged sword that has some special powers. And he might encounter some mythical creatures that are drawn to his solitary training, which he has to fight off while still trying to improve his skills.
There could be some minor gods or spirits as supporting characters. For instance, a nymph that lives near Percy's training area could provide him with fresh water or food when he needs it. A small god of the forest could give Percy advice on how to use the natural elements around him for his training. And there could be an old demigod who has retired from battles and now lives near Percy's training place. He shares his old war stories with Percy, which gives Percy new ideas and motivation for his training.
In this fanfiction, Percy living alone could mean a whole new set of adventures. Maybe he's chosen to isolate himself after all the chaos in the demigod world. He could be exploring his powers in solitude, away from the distractions of Camp Half - Blood. It also might lead to some self - discovery as he doesn't have to rely on his friends all the time.
Percy's character would be very different. Growing up alone, he would lack the social skills he has in the original series. He'd be more introverted. His view of the gods would be more cynical as he has no one to tell him the 'glorified' stories. He'd have to learn about his powers through trial and error, which would make him more cautious. He may also develop a stronger survival instinct. His relationships would be different too. He might be more hesitant to open up to others when he finally does meet people. Overall, his character would be a loner with a unique perspective on the demigod world.
He might face numerous terrifying monsters. Tartarus is full of dangerous creatures, and without his friends, Percy would have to rely solely on his own skills and the power of his demigod abilities to fight them off.
He uses his wits. Percy has always been clever, and in Tartarus, he'd use that to his advantage. He'd find ways to outsmart the monsters, like using the environment against them.
Percy living alone might also lead to him having a different relationship with the gods. He may become more independent from them, not relying on their occasional help. This could make the gods view him in a new light, either as a threat or as a more self - reliant and respected figure. He could start to question the gods' motives and actions more deeply, leading to some interesting confrontations or discussions.
He might use his superhuman strength and speed, which he has as a demigod. With his enhanced physical abilities, he can easily take on many foes at once. And his power over water is a huge advantage. He could use water to create distractions or directly attack the villains.
In this scenario, Percy would likely use his unique demigod abilities. His skill with water could be used in various ways, like putting out fires from spells or using water currents to disarm enemies. Maybe he'd also call on his sea - monster friends to help fend off dark creatures attacking Hogwarts.
One possibility is that Percy is on a self - discovery journey in Alaska. Since he's alone, he has time to think about his identity, not just as a demigod but as an individual. He might be learning survival skills from the Inuit culture there, which could be really interesting to explore in the fanfiction. Also, he could be trying to find a way to control his powers better without the distractions of the Camp Half - Blood.