Phineas

Phineas is a son of Neptune with the gift of prophecy. Even though he is able to see the future, he is completely blind.

History
Phineas was a son of Neptune who lived in the city of Salmydessus on the Black Sea with his two children and his wife (until her death). Phineas was able to see the future, as he had the power of prophecy. He would tell people of things the gods were planning, causing Zeus to become enraged. As punishment, Zeus caused Phineas to become blind and placed him on an island with a buffet of food. However, whenever he would try to eat the food, harpies would swoop down and take the food from him. He was forced to face this punishment until Jason and the Argonauts arrived on his island and sent the Boreads after the harpies, but spared their lives as a favor to Iris, the rainbow goddess. In return for their deeds, Phineas told the Argonauts how to pass the Symplegades; rocks that would randomly crash together and kill anyone trying to get past them.

The Son of Neptune
He is a blind son of Neptune that Gaea brings back to life and lives in Portland, Oregon. He makes a deal with Percy to exchange information, but the deal involves the two each drinking from two bottles of Gorgon blood. One bottle contains blood that will kill the person that drinks it, while the other will cure any illness the person may have, including Phineas' blindness and Percy Jackson getting his memories back. Phineas accepts the terms of the agreement and writes the information on a scroll and places it in his robes so that even if he picks wrong, he will still be able to give Percy the information he wants. While at first it appears he picks right, as his sight begins to return while Percy begins to experience pain, Gaea has tricked him into drinking the one that would kill him. Phineas slowly begins to turn to dust as he tries to find the information in his robes so he can destroy it before Percy can get it, but dies before he can find it. Moments before he dies, he claims that Percy will have a hard choice to make and he will make the wrong one.

Abilities

 * Phineas has the power of prophecy, since he is able to see the future.
 * This ability is limited to major events, as he is unable to see events of chance or coincidence.

Trivia

 * Vincent Martella made a quest appearance during the day of Olympian Week that Phineas was revealed to be in The Son of Neptune. Vincent Martella does the voice of the character Phineas from the cartoon Phineas and Ferb.
 * He is the only known descendant or child of Poseidon to be able to predict the future accurately.
 * Phineas in the book calls himself a son of Neptune, but in mythology his godly parent is Poseidon. This might be because he was in front of Roman demigods (other than Percy, but he thought he was Roman).