The main heroine of Polyphonica Black series initially appeared in episode 7 of Shinkyoku Soukai Polyphonica and later reappeared as a recurring character in several episodes. Matia is a silent girl with long black hair, eyes, and a cape. Despite her appearance, she is the Dantist, skilled at playing Commandia on her blues harp, an instrument similar to those of the past that requires higher technique to play effectively. Although not as complex as a One-Man Orchestra, Matia's harp is still a formidable tool in her hands. In addition to being a talented musician, Matia also enjoys hamburgers.