Serpent Demon

The Serpent Demon was a demon that was worshipped by Obanai Iguro's clan.

Appearance
The Serpent Demon has long black hair that reached past her shoulders, yellow eyes with thin slitted pupils similar to a snake, a wide fanged mouth stretching from ear to ear, and vein-like patterns around her eyes. Her long tongue was forked at the end and she had sharp nails on her hands. Her upper torso had three violet lines alongside the oblique of her chest. The lower half of her body was that of a traditional snake, with an elongated legless body covered in brown scales.

The Serpent Demon wore nothing but a gold necklace imbedded with various jewels and four larges pearls.

Personality
As with most demons, the Serpent Demon was extremely cruel and murderous towards humans. Notably, she had a disturbing preference towards eating children, especially infants, and requested them regularly as her favorite meal. Her sadistic pleasure in her choice of prey was also reflected when she deemed Obanai as something worthy to satisfy her, ordering that he be allowed to grow up before she could eat him, even having his mouth sliced open to look like her.

The Serpent Demon was arguably smarter than the average demon as she developed a contractual relationship with humans, which in turn gave her a safe feeding ground to eat in, a steady food supply of her favorite type of meal and a place to hide from both sunlight and Demon Slayers for hundreds of years completely undetected. Nonetheless, she paid no heed to their mistake of letting Obanai escape and killed nearly all of her worshippers before pursuing Obanai.

History
At an unspecified point in the past, the Serpent Demon encountered the Iguro Clan. The two sides struck a deal; they would feed her with their offspring in exchange for riches she would acquire from her attacks. She was even placed at the head of the clan and was worshipped like an empress. At some point Obanai was born, the clan's first male in 370 years. Because of this and his unique heterochromia, the Serpent Demon decided she would save him for later, cultivating him for years before reaching a size that satisfied her. At times, she would even visit Obanai in his cell whilst hidden, frightening him as he tried to sleep.When Obanai reached the age of twelve, he was brought before the Serpent Demon who had his face cut across the mouth so it resembled her own, with the blood he coughed being collected and served to her. Knowing he was in danger, Obanai secretly dug a means to escape and fled from his cell. Angered that her chosen prey had escaped, the Serpent Demon killed nearly every member of the Iguro clan, apart from one cousin of Obanai, and pursued him.

She caught up to him as he ran but was killed by the timely arrival of the Flame Hashira Shinjuro Rengoku, saving Obanai's life.

Infinity Castle
Obanai reminisces about the Serpent Demon when he sees Mitsuri Kanroji is too injured to fight Muzan Kibutsuji. Although he desires to confess his love to her, he believes his blood is impure as a result of his family's misdeeds and instead would rather die and meet her in another life where he can love her freely.

Abilities
Not much is known about the Serpent Demon's abilities, although given that a Hashira was dispatched to slay her, it can be assumed she was a reasonably powerful demon. However, given the past events didn't present the Hashira showing any visible struggle, it is likely that her strength was beneath that of the Twelve Kizuki.

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