Percy would initially be shocked and a bit scared. But then, his sense of responsibility would kick in. He would start to train himself to use the powers effectively. He might seek out the help of some of the more benevolent gods or goddesses who could give him advice. He would also have to deal with the envy or fear of others. However, Percy's loyalty and good heart would guide him to use the powers for the greater good, like protecting the demigods and the world from new threats.
In Percy Jackson fanfics, his powers are often enhanced and explored in creative ways. His ability to control water can be shown in more extreme situations, like creating massive tidal waves to protect his friends or using water currents to travel at super - fast speeds across the ocean.
He could go on adventures to the far reaches of the Underworld. With all the gods' powers, he might be able to access areas that were previously off - limits. He could also journey to the homes of the gods and goddesses to learn more about their powers and how to use them better.
In fanfiction, Percy Jackson's lightning powers often get enhanced or modified in interesting ways. Some authors might have him control lightning in more precise forms, like creating lightning cages to trap enemies. It adds a new level of coolness to his already amazing abilities.
Well, in Percy Jackson fanfiction regarding water powers, it often involves the characters pushing the limits of what's known in the original series. Some fanfictions might show a character using water powers to heal others, as water is often associated with life. There could also be a story where a character with water powers has to face an enemy who has a power that nullifies water, forcing them to find new ways to fight and use their abilities creatively.
There could be a fanfiction where a character with ice powers is actually an enemy in the Percy Jackson world. They are trying to freeze over all the water sources, which would be a huge threat to the demigods. Percy and his friends have to figure out how to stop this ice - powered foe. They might discover that the only way is to find a way to combine fire and water powers in a unique way, like using the heat from Hephaestus - forged weapons along with Percy's water control to melt the ice and defeat the enemy.
They are often portrayed as more versatile. For instance, a character might be able to turn water into ice sculptures that can come to life and fight for them. This is a step beyond what we see in the original books in most cases.
Percy could use his water - controlling powers in combination with Wolverine's adamantium claws. For example, he could cover his claws with water and freeze it, creating ice - blades that are even more deadly.
In the fanfiction, the power of fire manipulation could be really interesting for Percy to absorb. Since he is mainly associated with water, having the power of fire would create an internal struggle between his original element and the new one. Also, the power of teleportation would be cool. He could instantly travel to different places, which would make the story's pacing much faster and more exciting. And the power of mind - reading would give him an edge in understanding his enemies' plans and his friends' true feelings.
In Percy Jackson fanfiction, his fire powers can be a really cool addition. Sometimes, authors might give him these powers as a new aspect of his godly heritage. Maybe he gets it from a previously unknown godly ancestor related to fire. It could also be a result of some sort of magical encounter or a unique curse that turns into a power.