Monica Lux is one of the main protagonists in the new Netflix series Lost Song, the younger sister of Allu. Her trademark is her bunny-hooded cloak and her ability to mimic things once shes heard them. She pulls the hood over her head and falls asleep any time she is frightened and is often mistaken for a "weird creature".
Monica traveled with her sister, Allu as a rhythmist of the king's military to boost morale. They first appear while playing their instruments for military personnel who were making echo devices. They were doing what they could in order to make money to restore their mother's eyesight. With Monica's help, Rin sings the Song of Healing, restoring their mother's eyesight. Eventually, the sisters join Rin and her friends' journey to perform in the capital.