Originally the main heroine of Polyphonica Black series, she made appearance in episode 7 of the Shinkyoku Soukai Polyphonica, and played as a reoccurring character in various further episodes.

A silent girl with long black hair, black eyes, and a black cape. Although at first glance she appears to be the Spirit, Matia is actually the Dantist, and a good one. Her instrument is a blues harp. Although not as complicated as a One-Man Orchestra, it is similar to instruments of the past in that higher technique is required to play Commandia with it. She likes hamburgers.

(Source: Wikipedia)