Styx

Styx (スティックス, Sutikkusu) is a student at Tristain Academy of Magic and a suitor of Kirche von Zerbst.

Entrance Ceremony
At night, when Kirche is taking a bath, she mistakes Pelisson for Styx to have a date. Later, Styx is seen with Kirche who both witness Louise and Guiche in pursuit of Saito.

The Plebeian Familiar Spirit
When Kirche brings Saito to her room to confess her love for him, Styx levitates outside to intervene, telling her that she did not arrive at their appointed time to have a date. Kirche reappoints it, but Styx does not approve. Out of annoyance, Kirche blasts him off the window.