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Futakuchi-Onna (二口女 Futakuchi-Onna, lit. Two-Mouthed Woman) is a yōkai woman with a second mouth on the back of her head. She is a member of the Yōkai Castle trio alongside Tantanbō and Kamaitachi. Like her teammates, she first appeared in the Shonen Magazine story Yōkai Castle. In the 1968 anime, her name is instead Ōguchi-Onna (大口女 Ōguchi-Onna, lit. Large Mouth Woman).
Futakuchi-Onna has the appearance of a woman with long dark hair dressed in a kimono. As her name implies, she has a second mouth on the back of her head. Her second mouth is larger and has sharp teeth. In the original manga, her face was round and her regular mouth also has sharp teeth, but in most adaptations, her face is more conventionally attractive.
In the 1968 anime, Ōguchi-Onna has a face devoid of all features other than a large mouth.
In the 2018 anime, Futakuchi-Onna appears as a woman with pale yellow skin, pointy ears, and sharp white nails. Her long hair is white, having a pair of snakes with red pupil-less eyes and two strands that resemble snake tongues lie in front of her face. Her eyes have yellow sclerae with red irises and thin pupils. She wears a light green kimono with white trim and a red obi. After being revived by Nanashi, she has an upside-down pentagram mark on her forehead.
In the 1985 anime, Futakuchi-Onna constantly laughs during her tasks, especially during battles.
Futakuchi-Onna works with Tantanbō and Kamaitachi kidnapping kids to convert them into yōkai. She grabs Kitarō with her hair and tries to feed him to her second mouth, but Kitarō throws pepper into her mouth, causing her to reel back and fall out a window to her death. In the first and fourth anime adaptations, she survives the fall and continues to fight, and is turned to stone with her partners and the Yōkai Castle when the rope seal is placed around the castle.
Futakuchi-Onna is unsealed as a stone shrine is knocked over during construction, where she and the others cause havoc by making the construction machinery go haywire. She abducts a boy at an arcade and returns to the Yōkai Castle. She sneaks into the broadcast studio and kidnaps Nezumi-Otoko, escaping through the vents. After the Yōkai Castle rises from the ground, the two-mouthed woman uses her hair snakes to lift and crash a police car into another. In the castle, she chides Nezumi-Otoko for talking so big during his interview. She expounds that they are going to take the human's place and rule the world. They soon hear the clip-clop of Kitarō. Later after Kitarō escapes from Tantanbō's rock she sends her hair snakes to grab him, bringing the boy to her and tries to devour him with her back mouth. She is temporarily distracted as he uses his Yōkai Ocarina, where she throws him to the side, hanging by the roof. After being hit by his Hair Needles, she pulls him back and tries to devour him again. Just a she is about to succeed, she is struck by Sunakake-Baba's barrage of sand, stumbling off the broken railing and falls off, disappearing as she hits a sharp rock.
She appears in both episode #66 and 67 of the fourth anime adaption, Ominous Clouds! Yōkai Castle (Part 1) and Ominous Clouds! Yōkai Castle (Part 2). In this adaption, she spoke with a different voice from her second mouth.
She appears in episode #61 of the fifth anime adaption, Tantanbō of the Yōkai Castle.
Powers and Abilities
Hair Serpents: Futakuchi-Onna's hair can grow and form into serpents, which she uses to grab enemies to feed to her second mouth. Her hair serpents can grow to be over 200 meters.
- Enhanced Strength: Her hair snakes are strong enough to lift a police car and throw it with ease. They have also shown to be able to easily lift a petrified Konaki-Jijii and strangle him to force him back to normal.
Second Mouth: As her name implies, Futakuchi-Onna has two mouths, where the second is on the back of her head. It is much larger, being half the size of the back of her head and is filled with sharp teeth.
Flight: In the 1968 anime, she was seen flying among with other two.
Whirlwind: In the 1996 anime, all the members of the trio were seen to move swiftly in whirlwinds to a distant location in seconds.
Enhanced Agility: Futakuchi-Onna displays impressive jumping capabilities in the 1985 and 1996 anime. In the 1985 anime she demonstrates by jumping from the roofs of the building to the next.
In Japanese mythology and folklore, the Futakuchi-Onna belongs to the same class of stories as the Rokuro-Kubi, Kuchisake-Onna and the Yama-Uba, women afflicted with a curse or supernatural disease that transforms them into yōkai.
One legend tells of how the Futakuchi-Onna came to be is that long ago a wicked stepmother who always gave plenty of food to her own daughter, but never enough to her stepdaughter. Gradually the stepdaughter grew sicker and sicker, until she starved to death. Forty-nine days later, the wicked stepmother was afflicted with a terrible headache. The back of her head split open, where lips, teeth, and a tongue formed. The new mouth ached with debilitating pain until it was fed, and it shrieked in the voice of the dead stepdaughter. From then on the stepmother always had to feed both of her mouths, and always felt the hunger pangs of the stepdaughter she murdered.