-Nico di Angelo is a fourteen-year-old Greek demigod son of Hades and the mortal Maria di Angelo. He is also the younger brother of the late Bianca di Angelo and the half brother of Hazel Levesque. He is known in the Underworld as the “Ghost King” after taking the title from King Minos.
-Jason Grace was a Roman demigod, the son of Jupiter and the mortal Beryl Grace and the younger brother of Thalia Grace.
-Piper is the Greek demigod daughter of Aphrodite and Tristan McLean and is currently the head counselor of the Aphrodite Cabin. She is currently dating Jason Grace, son of Jupiter.
-Frank Zhang is a Roman demigod, the son of Mars and Emily Zhang, as well as a legacy of Poseidon and Chloris. Frank is one of the seven demigods mentioned in the Prophecy of Seven and is the current male Praetor of the Twelfth Legion Fulminata.
-Hazel Levesque is one of the seven heroes of the Prophecy of Seven. She is a fifteen-year-old Roman demigod, the daughter of Pluto and Marie Levesque, and the half-sister of Nico di Angelo. She is the current Praetor of Camp Jupiter and the former Centurion of the Fifth Cohort.
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