Powers/abilities
Percy, like most demigods, has these disabilities and traits:
* ADHD, which actually is heightened alertness that allows demigods to keep track of multiple things simultaneously during combat. In the case of Percy, he can even extrapolate where his enemies will strike simply based on how their muscles tense.
* Dyslexia, since his brain is hard-wired for reading Ancient Greek instead of modern languages.
* Percy has clairvoyant dreams, allow him to see events in distant locations in out-of-body experiences. This is a general feature of demigods, but becomes even more intense during times of strife and when pivotal events are in motion. Percy has an inherent knack for seeing otherwise hidden things thanks to his unpredictable, changeable nature, inherited from his father, Poseidon.
In The Lightning Thief, Percy is given a magically enchanted sword called Anaklusmos (Riptide). It is made of celestial bronze, a fictional metal which will injure immortals and monsters, but not mortals, who are not 'important' enough for it to harm. Many demigods use celestial bronze weapons, though Anaklusmos is shown to be a far more powerful weapon against monsters than most other blades of its kind. In its dormant form, it appears as a ballpoint pen, though in a dream, Percy sees it in the form of a hairpin. Percy is unable to lose it as it will always return to his pocket soon after being dropped.
Children of the "big three" (Zeus, Poseidon, or Hades) are far more powerful than demigods of the other Greek gods and goddesses. Hence, Percy has a wide range of abilities.
* Percy is a naturally talented swordsman, often able to hold his own against larger, stronger, and more experienced opponents, even the god of war, Ares.
* Percy possesses incredible physical strength. He tore a horn off the head of the Minotaur, and was able to bear the weight of the sky for some time, the curse of Atlas.
* Percy has a psychic connection with his friend Grover, called an empathy link. According to Grover, if either of them die, the other might as well.
* In The Last Olympian, Percy bathes in the River Styx (like Achilles), making him nearly invulnerable except in one weak point, analogous to Achilles' heel (the small of his back, directly opposite the navel) and also granting him highly increased strength, speed, and endurance. After bathing in the Styx, he can supply the forces required to form a miniature hurricane for some time.
[edit] Aquatic/hydrokinetic abilities
Percy has numerous powers specifically connected to the domains of Poseidon: seas, horses, sea creatures, storms and earthquakes. His water-related abilities tend to be stronger in sea water than in fresh water. Like most other demigods, using his abilities tires him in proportion to the intensity and duration whatever he does.
* Upon contact with water (or later, with his abilities more developed, near water), Percy gains a disproportionate amount of strength, combat skill, and speed. This effect wears off soon after leaving the water.
* Percy can control large volumes of water with great force (hydrokinesis). For example, he can redirect rivers, create currents to push boats or himself, or even increase surface tension to the point where it is firm enough to stand upon. On a smaller scale, he can also hold back the tide and redirect waves, apparently relying on pressurization.
* In the end of the first series, he pulls air bubbles together to form one larger one for Annabeth and himself.
* Percy can breathe underwater. He is unharmed by water pressure of any amount, or by falling from great height into water.
* When Percy is underwater, he stays dry unless he consciously forces himself to become wet. When Percy touches objects underwater, they also become dry.
* Percy can create seawater with little effort with things that used to be in the sea (such as petrified seashells, as in the book The Battle of the Labyrinth). With effort, he can also do this without any derivatives.
* Percy can communicate telepathically with marine life, horses, horse related creatures (including mythical horses, such as pegasi), most of whom also obey him and treat him with respect. They tend to treat him with some deference and work to accommodate him; a notable exception are the flesh-eating horses in The Battle of the Labyrinth.
* While at sea, Percy has perfect bearings on his exact coordinates.
* Percy can control all parts of boats telekinetically, especially sails.
* Percy can sense objects if they are underwater.
* Percy can communicate with children of Poseidon, such as the Cyclopes, underwater.
* Percy is very resistant to burning, and is able to survive for a time while immersed in magma because of the power of the ocean inside of him.
* Percy can summon water from bodies of water that are vast hundred of miles away from Percy. However, doing this nearly killed him the one time he tried in Mt. St. Helens.
* Percy can summon hurricanes, as he did in The Last Olympian, since his father is the god of the sea and storms, though he can't sustain such tremendous force for very long.
* Percy can release the oxygen diffused in water and force the surrounding water to recede, making an air bubble so his friends with non-hydrokinetic abilities can breathe.
* Percy can control ocean currents to propel him at great force underwater, or even up into the air, as he does in his duel with Ares.
* Percy can cause water to form stronger-than-normal hydrogen bonds on the molecular level to form shields strong enough to deflect shards of glass.
* Percy has an accelerated healing factor when standing or immersed in water, quickly healing any wounds and curing him of most forms of poison.
* Percy can share his healing factor with others so long as they are both immersed in water (only displayed in the movie).
* Percy can summon earthquakes as he does at Mount St. Helen's in The Battle of the Labyrinth, since his father is the god of earthquakes.