イリオネーラ・ナギ・アタランシア

The first princess of the underwater city Atalancia, nicknamed "Rio". After her predecessor and mother Mariela, passed away, it was decided that she would become the next queen. She has a calm demeanor, overflows with motherhood, and is a little naive about the world. She likes to dote on her sister Lill.

Like her younger sister, she's actually much older than she appears to be due to the effect of her royal blood, which is a mix of sea dweller- and land dweller-DNA, that makes them age more slowly and look more like human beings. Since she's the crown princess but she only told her actual age to Natsumi in secret, and the only hints are her fathers age at death and him coming over during a war, one can only take a guess that she's probably between 60 and 80 years old at the time the game is set