One new ability could be ice - skating at super - speeds. He could glide across water or land, using his ice - skates made of pure ice, and quickly reach his destination or dodge attacks. It would be like a combination of his natural athleticism and his new ice powers.
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.
Perhaps he gets the power of astral projection. He could send his spirit out of his body to explore areas that are otherwise inaccessible or to spy on his enemies. This would be a very useful power especially when dealing with secretive foes or trying to find hidden places in the mythological world.
One possible new power for Percy Jackson in fanfiction might be the ability to communicate with all types of mythical creatures, not just those related to the sea. This would expand his network of allies and give him more knowledge about the mythical world.
Well, in fanfiction, Percy could have the power to control storms on a global scale. Imagine him summoning massive hurricanes to defeat his enemies or using gentle rain to heal the land. It would be a huge upgrade from his existing water - based powers.
In Percy Jackson new elemental powers fanfiction, the power of time could be a new addition. A character might be able to slow down or speed up time in a small area, affecting the elements within it. For instance, if they slow down time around a fire, it would seem to burn more slowly. Also, the power of space could be introduced. This could allow a character to manipulate the space between elements, like pulling water from a far - off source or compressing air to create a powerful blast.
It might have the ability to absorb and redirect magic. If an enemy casts a spell at Percy, the katana could absorb the magic and then send it back at the attacker, amplified. This would give Percy an edge in battles against magic - using enemies, as he could turn their own magic against them with the help of the katana.
If Percy had ice powers in fanfiction, it might also affect his relationships. His friends would see him in a new light, perhaps with a bit of awe or even some jealousy. He could use his ice powers for fun, like creating ice sculptures during downtime at Camp Half - Blood. This would add a new dimension to his character and the overall atmosphere of the story.
He could have the power to freeze water instantly. Since he has a connection to water already as a son of Poseidon, this would be an extension of that. He might also be able to create ice storms and blizzards at will.
He could have the ability to use Sonido, which is a high - speed movement technique in the Arrancar world. This would make him much faster than normal ninjas. Also, his zanpakuto could have unique abilities, like the ability to cut through space - time, which would be a huge advantage in battles.
As an immortal, Percy has a lot of time to master his skills. He could have developed new ways to use his powers. Maybe he can now turn water into different shapes like ice spears or steam clouds for offensive and defensive purposes. His immortality also means he can take more risks in battle without fearing death, which could inspire the Avengers to be more daring in their strategies. He could be the wild card that the Avengers need to take on even more powerful threats.