She is very innocent and dedicated. It is also noted that she is a beautiful singer. Despite her role as the titular character, she is a bit of an enigma within the series, as her origins have yet to be explained. She seeks to heal the heartaches of others, resulting in the filling up of a mysterious bottle called a "flask" with the suffering of those people's hearts so that someday she will be able to go to a certain place that she really wants to go. It has been implied that she came from another dimension.