The prophecy, as stated in "The Lightning Thief", is:
"A child of the eldest shall rise, born of the sea, who shall face the tide of darkness. A hero's child shall stand, a chalice of power, destined to lead. For when the seven have fallen, the world will fall with them."
Percy fits the description:
* Child of the eldest: His father is Poseidon, the eldest brother of Zeus.
* Born of the sea: He is a demigod son of Poseidon.
* Destined to lead: He plays a crucial role in fulfilling the prophecy and saving Olympus.
However, it's important to note that the prophecy is quite vague and open to interpretation. While Percy clearly fulfills the main aspects, other characters in the series also possess qualities that could potentially fulfill the prophecy.
Overall, while other characters might also be seen as fulfilling certain aspects of the prophecy, Percy Jackson is considered the central hero of the prophecy and the one who ultimately leads the charge to fulfill it.