Cocona Vatel

Chroah's little sister. Gets along with him and calls him "Chro". She has no blood relation to Chroah however, but was taken in as family when she was rescued by him 2 years prior during a particularly bad IPD outbreak where she lost her real family. She is a Reyvatail herself but she has not yet matured and is unable to use Song Magic fully. However, she is able to craft a little fire ball in combat showing that she might have command of the most basic Song Magic that all Reyvateil can use. Wanting to help Chroah, she toughens up physically and practices in close combat. In the progress of the story she gets infected up to Lv.7, even then, Chroah tries to protect her but is defeated by Legris and other knights. It´s shown that Chroah really cares for Cocona, and soon after her rescue, Chroah starts to question the actions of the organizations around him. Her feelings for Chroah are extremely strong and her bond with him will eventually be tested. After events of Ar tonelico 2, Jakuri entrusted her a mission to Tylia's Tower, one that would put not only the fate of all the regions around the Towers at the balance, but also the fate of the very planet (Ar Ciel) they live in.