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Blue Skinned demon, the name of such a race was quite uncommon, and their origins were also a mystery, they only knew that this race of demons were capable of controlling Green Skins, a race of demon-like monsters. It was speculated that they were a superior Green Skin, some sort of King amongst Kings, an Emperor, who evolved into an actual demon and turned his skin color from green to blue, becoming something akin to a god for the Green Skins, a figure that has been actually venerated through the Green Skin's lore for generations.
Check "The Protagnist's Sister Is Actually the Strongest"!