The story would change in many ways. Firstly, the settings would likely be more gloomy and foreboding. Percy's home environment, which was somewhat normal in the original, could be a place full of strange and creepy things. His interactions with other characters would also be different. Instead of friendly banter, there could be a sense of suspicion and unease. For instance, when he meets new demigods or gods, he might not trust them immediately and be on guard all the time. And the plot would not revolve around the typical prophecies and saving the world in a traditional heroic sense, but rather about escaping from or facing the terrifying things that come from a Creepypasta - inspired world.
He might be a much darker and more edgy character. In a Creepypasta - influenced upbringing, he could be constantly on edge, seeing threats everywhere. His view of the mythological world might be distorted, perhaps seeing the gods as more malevolent entities.
Well, for starters, Percy's upbringing in Skyrim would mean he'd be exposed to a completely different culture and set of beliefs. He'd grow up learning about the Daedric Princes instead of the Greek gods. His character development would be shaped by Skyrim's harsh environment and its own brand of heroism. He might not have the same group of friends as in the original story. Instead, he'd befriend Nord warriors, mages, and thieves. His adventures would be centered around Skyrim's cities, dungeons, and wilderness, and his goal might be to become a hero in Skyrim rather than fulfilling a prophecy in the Greek world.
The plot of the story would take a whole new turn. Percy would likely be involved in different quests. Instead of quests related to saving the world from Titans or Giants, he could be involved in Underworld - related problems like stopping a rebellion among the dead or dealing with power struggles within the Underworld itself. His allies would also be different. He might team up with Underworld creatures like the Furies or the ghosts of powerful heroes instead of the demigods from Camp Half - Blood.
His powers might become more related to the night. He could gain the ability to see clearly in the dark, like having night vision. Maybe he could also manipulate shadows, using them as a form of defense or offense. For example, he could create shadowy constructs to fight his enemies.
If Percy Jackson was raised by a warrior in fanfiction, his character would likely become more battle - hardened from an early age. He might be more confident in his combat skills and less hesitant in dangerous situations. For example, instead of gradually learning to fight monsters as in the original story, he could already have a warrior's instincts, making him a more formidable opponent right from the start.
He'd become more powerful. His combat skills would be enhanced, and he'd have a better understanding of the primordial forces. He might also become more unpredictable in battle, like Chaos itself.
Percy's personality would be a far cry from the original. He'd be more secretive, for one. Growing up in the Underworld, he'd learn to keep his cards close to his chest. He'd also be more intimidating. His sense of humor might be darker, and he'd have a different moral compass. Instead of the typical heroic values, he'd have values more in line with the Underworld's survival - of - the - fittest mentality. He might be more distrustful of others and less likely to form quick alliances.
He would probably be more haughty. Hera has a certain air of superiority, and being raised by her might make Percy think he is above others in some ways. He could also be more secretive, as Hera often has her own schemes and Percy might learn to keep things to himself.
If Percy used a hammer in fanfiction, it would likely attract the attention of different gods and creatures. Gods associated with the power of the hammer might take an interest in him, either as a potential ally or a threat. His relationships with his friends might also change as they adjust to this new aspect of his abilities. For example, Annabeth might have to come up with new battle strategies that incorporate the use of the hammer. Also, Percy's identity as a hero could shift. He'd no longer be just the'son of Poseidon' hero, but also a wielder of a powerful hammer, which could give him a new reputation in the demigod world.
If Percy were a baby in fanfiction, the power dynamics at Camp Half - Blood would shift. Without Percy's combat skills and leadership, others would need to fill the void. The story might focus more on the characters' attempts to protect and care for baby Percy. And there could be new plotlines about finding a way to reverse his condition, which could involve seeking help from new or unexpected sources.