Bonus phone call thanks to Luna!
By the way, we know that the TV-Asahi page spells the grunts' name as Ghouls. I just didn't want to use that because Ghouls in the west are more associated with undead and zombies.
So we took it back to the etymologicaly roots and used Ghul, since Ghoul comes from the Arabic word Al Ghul. Since the grunts have demon horns, I think a word that's more associate with demons is better. If this sounds familiar, that's because the Batman villain Ras Al Ghul has it as part of his name, plus he's known as the head of the demons. So this all works out.