Titan lord of time and the primary antagonist of the original Percy Jackson series. Defeated by the Olympians in the first Titan War and imprisoned in Tartarus, he reassembles himself through the bitterness of neglected demigods. Possesses Luke Castellan's body for his return.

A Titan's daughter cursed to remain on Ogygia and fall in love with every hero who washes up on her island. Released from the curse by Leo Valdez, she spends the Trials of Apollo series adjusting to mortality.