Dali Dantalion

Dantalion Dali is one of the prestigious professors at Babylus Academy, a school in the demon world. He is the most senior professor currently known at Babyls, serving as the Teaching Supervisor of the Academy. He also teaches Demonic History and is the Homeroom teacher of Eiko Oni's class. Together with Stolas Suzy, he is often seen as Event Coordinators/Announcers of the school.

(Source: Mairimashita! Iruma-kun Wiki)