Percy is the son of Poseidon, he was sent to Camp Jupiter in exchange of Jason in order to bring the camps together. After his help on the quest to free Thanatos he was made the second preator of Camp Jupiter.

Reyna Avila Ramírez-Arellano is a Roman demigod, the daughter of Bellona, and the younger sister of the current Queen of the Amazons, Hylla. She is a praetor of Camp Jupiter.

Annabeth Chase is the daughter of Athena and is the head of the Athena cabin at Camp Halfblood. She is on a quest to retrieve the Athena Parthenos.

Jason Grace was the Roman demigod son of Jupiter and the late Beryl Grace, as well as the younger brother of Greek demigod Thalia Grace. Jason was a praetor of the Twelfth Legion at Camp Jupiter until his memory was erased and he was sent to Camp Half-Blood.

Piper McLean is the Greek demigod daughter of Aphrodite and Tristan McLean. She is the Head Counselor of Aphrodite's Cabin and one of the demigods of the Prophecy of Seven.

Leo Valdez is the Greek demigod son of Hephaestus and the late Esperanza Valdez. He is one of the seven heroes of the Prophecy of Seven.

Frank Zhang (also known as Fai Zhang by his Grandmother) is the Roman demigod son of Mars and Emily Zhang, as well as a legacy of Poseidon. He can shape-shift into animals.

Hazel Levesque is the Roman demigod daughter of Pluto and the late Marie Levesque, and the paternal half-sister of Greek demigods Bianca and Nico di Angelo. She is one of the seven heroes of the Prophecy of Seven.

Niccolò "Nico" di Angelo is an Italian-born Greek demigod son of Hades and the late Maria di Angelo, and the younger brother of the late Bianca di Angelo and the paternal half-brother of Roman demigod Hazel Levesque.

William "Will" Andrew Solace is a sixteen-year-old Greek demigod, the son of Apollo and Naomi Solace. He is openly bisexual and dating Nico