SIN ANALYSIS
Is a snake, but also notably clarified to be a demon. This combined with how extreme her animal aspect is makes me think she’s a particularly old/powerful species of demon.
Is based on both the serpent in the garden of Eden and Lucifer’s mate from Paradise Lost, who gave birth to death. This means she was likely the one who carried Mors.
Due to her status as the Serpent, she is likely the person who turned Reficul into a devil. If she has the power to do this, she might be more of a big deal than anyone thinks. Keep in mind that Gokuen beat the shit out of Satanick, so Gods and Devils aren’t always the top standard for power in Mogeko worlds.
She might have ruled the Pentagram world’s demons before Reficul became the devil. If she didn’t, she and Reficul probably created them together.
Due to both her diamond pattern on her tail and how the serpent tempted humanity into eating the fruit of knowledge, I have a feeling she is tied to the human mystery, possibly even being responsible for the human world.
Her union with Reficul gave birth to a demon of death. I think that alone should be an indicator of how powerful she really is.
Mogeko stated that Reficul is entirely devoted to her, making her one of the first examples of a “lesser” creature being above a devil in demon hierarchy. Keep in mind that Reficul is generally the most orderly and seemingly respected out of all the devils. Their love for each other must be hardcore.
And, I saved the most important for last. The key around her neck. I have no doubt as to what it is - namely, it is the key to the seven seals that keep hell from overtaking the earth. And how many Mogeko worlds are there, counting the human one? Seven. This indicates that Sin’s plan might be the conquest and/or destruction of all the worlds. She seemingly has the same plan that Satanick hints at in the LOGS, except unlike him, Sin seems actually competent.
In short, I think Sin might be a schemer on the tier of, if not beyond, Sagan. She might be cute with Reficul, lovable, and pretty, but let us not forget that she is based on the very first villain in the bible. Elux might be evil, but I don’t think their opposite number is any better. I can’t wait to see her connections with the human story :3c
Some other cool things to note:
In the above pond image she is surrounded by demonic hounds. Going by her relaxed posture and how the hounds seem relatively at ease, they are most likely on her side. I wonder if she’s tied to GriRea in some way? Purple and Green are opposites, after all, and her son is a death demon.
What with the above-mentioned diamond thing, her almost undeniable tie to humanity via being the serpent, and the pentagram/pentacle motif of her world, I think Kurokawa and by extension the supernatural parts of Nataka’s story take place in the Pentagram world, as the stars in the kurokawa promo are all explicitly made to be pentacles. Noir being in Wadanohara doesn’t even deconfirm this, as reficul transports demons outside her world due to how often she “walks”, like with Lowrie.
Reficul and her are the best mogeko couple.
