Ubume

As a human, Ubume was thought to be a caring parent who doted on her loved ones, especially her daughter Sae. That image hid a cruel and self-serving nature; she prized only her own pleasure, even at others' expense. Her outward warmth masked a merciless lack of empathy.

She felt intense joy while tending to suffering children, and to prolong it she would deliberately worsen their condition. Anyone who refused to play along she branded ungrateful and treacherous, recasting herself as the victim while dressing up her abuse as maternal love. When one of her captives showed her affection and pleaded for her safety, she discarded the child and used the distraction to strike a fatal blow against her opponent.

Decades earlier, Ubume lived as a woman called Yae with an abusive, gambling husband and her young daughter Sae. When he planned to leave her for another woman, she killed him and made it look like an accidental drowning, helped by his known poor eyesight. After Sae fell ill, Yae devoted herself to nursing her, but rather than letting her heal she prolonged the girl's agony so she could keep caring for her, and killed her when she tried to flee. Muzan Kibutsuji then turned her into a demon himself.

As Lower Rank One, Ubume was the strongest of the Lower Ranks at the time, close to rivaling the Upper Ranks. She held her own against the Wind Breathing slayers Sanemi Shinazugawa and Masachika Kumeno, killing the latter before she fell. She possessed enhanced regeneration, casually reattaching a severed arm, along with great speed, strength, and endurance.

Her Blood Demon Art conjures illusions: by burning her blood in an incense vessel, she fills a building with a sweet, rotten fragrance that bends perception, even turning a room into the walls of a stomach. The spell is broken only when the burner is shattered, which exposed her grand house as a decayed ruin. She is also deeply manipulative, talking her way out of danger and twisting victims into defending and sympathizing with her.