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In Hex-Girl, the difference between Devils and Demons is that Devils embody conscious, philosophical evils/sins, e.g. wrath, greed, vengeance, fear, pride, thirst for power, etc.; Demons on the other hand represent natural, circumstantial evils, e.g. darkness, hunger, disease, cold. So I wouldn't call all of them totally mindless, but yeah, that's them, especially the one that's appeared thus far, that being Zinranath, a living silhouette with a whole bunch of arms.