If Percy was Loki's son in a fanfiction, it would be a wild shift. His connection to the Norse mythology would be much stronger. He might have an easier time dealing with magical illusions since Loki is a master of that. Also, his attitude towards the gods would be different. Instead of the Greek gods being his main focus, he'd have to consider his Norse heritage too. Maybe he'd be more of a wildcard, not fully fitting into the Greek demigod mold.
In a fanfiction where Percy is the son of Loki, the Percy Jackson storyline would be drastically altered. His origin story would be a blend of Greek and Norse elements. He could potentially have the ability to shapeshift like Loki. This would give him an edge in battles and also make him more unpredictable. His friends might not trust him as easily because of Loki's reputation. And his journey would be less about fulfilling Greek prophecies and more about finding his place between two very different mythologies.
Well, if Percy was the son of Loki in a fanfiction, it would completely turn the Percy Jackson storyline upside down. Percy's powers would likely be a mix of his demigod abilities and Loki's trickery. His relationships with the other characters would also change. For example, his loyalty to Camp Half - Blood might be questioned as Loki is known for his duplicity. He could have a more mischievous side and might not be as straightforward in his actions as he is in the original stories.
Percy's relationship with the other campers at Camp Half - Blood would be a rollercoaster. The children of Poseidon might feel a bit betrayed or confused, as they thought Percy was one of their own. However, Percy could use his new status to bridge gaps between different cabins. For example, he could work with the children of Aphrodite to improve relationships in the camp, since Hera has some connection to love and relationships in a different way than Aphrodite. With the gods, his relationship with Zeus would be extremely strained, given Zeus's past issues with Hera. But he might find new allies among the gods who are friendly with Hera, like Hephaestus. Overall, Percy's relationships would be a mix of challenges and new opportunities.
The storyline would change drastically. Percy would be able to do things he couldn't before. He might be able to defeat stronger enemies with ease using the Infinity Stone's power.
Well, instead of summoning water or having a connection with the sea, he might have the power to shift shapes, a common ability associated with Loki. He could turn into different animals or even other people to gain an advantage in a fight or to infiltrate an enemy's stronghold. Also, his power over fire could be enhanced, as Loki has some association with fire in Norse mythology. He could use this to create distractions or attack opponents from a distance.
Percy would likely become more devious. Growing up with Loki as an adoptive father, he'd be exposed to Loki's tricks and lies. So instead of his straightforward, if sometimes impulsive, nature in the original Percy Jackson stories, he might think more about the different angles of a situation before acting.
If Percy Jackson was born a Roman in fanfiction, a lot would change. For one, his training and upbringing would be different. He'd be in the Roman camp from the start, so he'd be trained in the Roman style of combat and leadership. His relationships would also be different. Instead of his close bond with Annabeth from Camp Half - Blood, he'd form different friendships within the Roman camp. Maybe he'd be closer to Hazel or Frank. His view of the gods might also be more in line with the Roman view, which is more about duty and honor to the state as well as the gods.
If Percy was the son of Achilles, his relationship with Annabeth might become more strained. Percy could become more headstrong and impulsive because of the influence of Achilles' traits, which would clash with Annabeth's more strategic and cautious nature. For example, in battle situations, Percy might rush in without a proper plan, causing Annabeth to worry more about his safety and get frustrated with his new behavior.
He'd probably be more aware of his appearance. Instead of just being a scruffy, normal - looking demigod, he might take more care in how he presents himself. He could also be more charming without really trying, which might get him into trouble sometimes as people might misinterpret his intentions.
Percy would likely become more conflicted. His previous identity as the son of Poseidon shaped his values and actions. But as the son of Kronos and Rhea, he'd have to reevaluate everything. He might become more cautious, as he now represents a more controversial lineage.
Percy would likely become more studious. Since Athena values knowledge, he would be more interested in learning about history, magic, and other aspects of the demigod world. He might spend more time in the library at Camp Half - Blood, much to the surprise of his friends. His relationships with others would also change. He could be more aloof at first as he tries to adapt to his new role, but as he grows into it, he would form deeper, more intellectual connections with those around him.
If Percy was the son of Aphrodite, it would make the story much more about relationships and less about the traditional battles. His storylines could involve using his charm to defuse situations rather than his sword. He might be more focused on bringing people together or causing romantic chaos. Also, his connection to the other gods would change. Gods who have a different view of Aphrodite might treat Percy differently. He could be a target for jealousy from some gods' children who feel he has an unfair advantage in the love department.