Belzebuth

Belzebuth stands as the most powerful and trusted confidant of Demon Lord Kulod, boasting a lifespan that stretches beyond a thousand years and holding a rank among monsters second only to the Demon Lord himself. Having watched over Kulod since childhood, he demonstrates an unshakeable depth of loyalty toward his master. Despite possessing immense combat ability, his straightforward and guileless nature often leads him to deliver bewildering chuunibyou proclamations, all while remaining an indispensable pillar of the demon lord's faction.