Doctor Melphius is the school "nurse" for Kojo Academy's night class. In addition to working at Night School Doctor Melphius also works at a local sanitarium where Mavik was being held at.
Doctor Melphius is jolly and good natured but he also has a dark side. On the rare occasions when Melphius does get upset in some way he turns from his normal gentle giant self into the little imp Jysst.