Nosgalia

Nousgalia (ノウスガリア, Nousugaria)

History
He first appeared as a new teacher in Anos's class under the Eldemade disguise. He then told the students that Anos is the real Demon King, and showed the student the Contract  saying that Anos is the real demon king which was signed by many famous demons, especially the seven demon emperors.

Nousgalia's body belongs to the Blaze Death King Eldemade.