Nico di Angelo is a fictional character in Rick Riordan's "Percy Jackson & The Olympians," "The Heroes of Olympus" series and The Trails of Apollo. In the series, he is the demigod son of Hades and mortal Maria di Angelo. As such, Nico has extraordinary powers of necromancy and the power to command the dead; he is a son of one of the "Big Three" Greek gods, the other two being Hades' brothers Poseidon and Zeus. Nico is chronologically over eighty years old as a result of his prolonged stay in the Lotus Casino in Las Vegas, an enchanted hotel where one does not age and time does not pass at its normal pace. He was ten years old in the Titans Curse. He and his sister, Bianca Di Angelo, were placed in the Lotus Casino sometime around World War II and eventually taken out by a “lawyer” (The Fury, Alecto) when Hades commanded. He also found his half-sister Hazel Levesque in the Underworld and took her back to Camp Jupiter as she was a child of Pluto. He is currently in a relationship with Will Solace.