Serpent Demon

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She moves with a snake's boneless, slithering speed and pursued the young Obanai through the night after his escape, nearly catching him before Shinjuro Rengoku intervened and killed her, as shown in Obanai's flashback during the Hashira Training Arc.

The demon worshipped by Obanai Iguro's family takes the form of a woman with a serpentine lower body, pale skin, and unblinking eyes that fixated on the household's newborns.

The Serpent Demon is possessive and predatory, delighting in the fear of the caged child Obanai and demanding human sacrifices from the family that worshipped her in exchange for wealth.