I would like to say something on the wiki about "beelzebub" the boss looks more like a locust looking at the hind legs/legs (in the first form) they look more like a locust than a fly and the crown may represent that he is the king of locusts and abaddon (the angel of the abyss) is at the head of infernal locusts will not be a demon in tradition... but not even sariel of this franchise is a demon but a fallen angel (grigori)