Nio and Rio. Cute little twins with a complicated history. Nio is a girl and Rio is a boy. They

were once a proud powerful goddess called Hio (destruction) until Kronos changed time

to attack them when they were a young goddess. They were naive when they were

younger but had the power to fight Kronos. Kronos beat them in the end and split their

powers in the the mischievous twins Nio and Rio. Now both twins are at Camp Half-Blood

to help the demigods beat Gaia...