The Mother Spider Demon was a member of the Spider Family.
Appearance
She's a short woman with long white hair, red facial markings, and a notably curvaceous build. She typically wears a long white kimono with flowing sleeves. What's striking is that her current look is entirely artificial—her original form was small and almost childlike, with simple black hair, X-shaped pupils, and no visible chest. Fans have noted that she essentially rebuilt herself from scratch to match what Rui wanted in a mother figure.
Personality and Backstory
Like most demons, she was naturally cruel and murderous toward humans. But her time in the Spider Family twisted her into something else entirely. Both Rui and the Father Spider Demon abused her relentlessly for being too weak, and the mistreatment was so severe that she eventually welcomed death as an escape. She couldn't bear the thought of continuing to exist under their abuse.
Here's the darker irony: she was technically the youngest demon in the "family," still clinging to fragments of her human memories and emotions. She'd cry and grieve when these memories surfaced, which made her unsuitable as a "mother" in their eyes—especially since all her "children" were older than her in demon years. Rui punished her harshly for these lapses.
In her final moments, something shifted. She seemed to reconnect with her humanity and was genuinely moved by Tanjiro's kindness, even wishing him luck as she died.
Content compiled by AnimeList.moe from publicly available sources.
