Yamambaa (Japanese: ヤマンバア), also known as Yamamba (Japanese: 山姥) and Gesshin Tsukuyomi (Japanese: 月神ツクヨミ Gesshin Tsukuyomi) is a Shadowside Yo-kai of the Omamori tribe and the Onnen Tribe set to appear in Yo-kai Watch: Forever Friends.
- Yo-kai Watch: Forever Friends: Minor Yo-kai
- Yo-kai Watch: Wibble Wobble: Befriending Yo-kai
- Yo-kai Watch 4: Befriending Yo-kai
Yamambaa's Godside form, Gesshin Tsukuyomi is a beautiful female Yo-kai with fair skin, amethyst purple eyes that fades to fancy light yellow, hair with lemon-lime green on the top of her head while the rest is ultramarine blue with four lower ponytails and the hair is topped with a gold full moon-shaped hairgrip with two gold kanzashi. She wears a orange peel orange, light sea green and light yellow kimono tied by a magenta obi with yellow and cyan little obis. Worn under the kimono, is a aero blue sleeveless yukata which fades to light yellow while the inside is like a starry night sky. She is also barefoot and has a magenta ankle ring with a cyan jewel dangling.
Yamambaa was available in the Y-point shop during the Forever Friends event. She cost 1000 Y-points.
Gesshin Tsukuyomi was available during the Yasha Enma Budokai, where she randomly appears after completing a round.
Depending on the text and translator, the Yamauba appears as a monstrous crone, “her unkempt hair long and golden white ... her kimono filthy and tattered,” with cannibalistic tendencies. In one tale a mother traveling to her village is forced to give birth in a mountain hut assisted by a seemingly kind old woman, only to discover, when it is too late, that the stranger is actually Yamauba, with plans to eat the helpless Kintarō. In another story, she raises the orphan hero Kintarō, who goes on to become the famous warrior Sakata no Kintoki.
Yamauba is said to have a mouth at the top of her head, hidden under her hair. In one story it is related that her only weakness is a certain flower containing her soul.
"Tsukuyomi" is based on the Shinto deity of the same name. though mostly depicted as male, and is seen as the god of the moon. Tsukuyomi was born from the right eye of the primeval being Izanagi during Izanagi's cleansing of himself during his trek into Yomi to see his deceased wife Izanami.
- She's the first Yo-kai to change tribes between her Lightside and Shadowside forms.
- Yamambaa is the second Yo-kai to have both a Shadowside and a Godside form, the first being Nekomata
- In Yo-kai Watch: Forever Friends, Yamambaa's Shadowside form, Yamamba, appeared to be a fusion between Yamambaa and Tae's grandmother.