- "Protect the Four Archfiends' seal. Make sure the Grand Demon is sealed up good. Make sure no one, not even the Gods themselves, free any of them. I have been tasked witht his. Are you surprised? That I, a demon, am helping humans for a duration of time that could very well be eternal? I'm sure you are, they always are. It's as if they classify all Demons in the single stereotype of "evil incarnation of all the sins". Well, not like you humans are any better. The clearest difference I see between our races is...is purely in terms of visual aspects and power."
- — Zarkos' goal and way of thinking
World Serpent (世間蛇, Seken Hebi)
Guardian of the Four Archfiends
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Zarkos (ザーコス, Zākosu) is an ancient Demon, bearing a strong dragonic appearance, that is assigned as the guardian of the Four Archfiends and their seals, making sure they aren't freed, much like how Naraku Monban protects the temple seal of the Grand Demon. Located in the Pergrande Kingdom, he is a known figure in the country, being viewed in a positive light by the majority of the citizens, even being aquainted with the rulers of each generation. Zarkos is commonly as the World Serpent (世間蛇, Seken Hebi), due to his serpentine appearance and duty as a guardian, as well as the Black Sky Dragon (黒竜空, Kokusoraryū), due to a common phenomenon occuring in his presence, being the sky blackening.