Jake Mason

Jake Mason is a Demigod son of Hephaestus, and the counselor for Hephaestus' cabin after Beckendorf's death.

The Last Olympian
Jake first appears in The Last Olympian and helps brainstorm with Percy, Annabeth, Chiron and the other campers in order of how to defend Manhattan in the Battle of Manhattan and the Empire State Building which was the entrance to Mount Olympus over America. He fights with his cabin, and when the Second Titan War is won, he is among the campers that goes up to Mount Olympus and was thanked by the gods. He becomes the lead counselor for his cabin after Beckendorf dies of an explosion on Luke's "cruise" ship, Princess Andromeda.

The Lost Hero
Jake is in a full body cast after going after Festus, the dragon, and unsuccessfully trying to fix or capture it. He believes that there is a curse on Hephaestus's children after Beckendorf died. He resigned after Leo revealed Bunker 9, and the Cabin began construction on the Argo 2.

Trivia

 * Jake is the only known Head Counselor to willingly resign.