Wakasa Mermaid (若狭の人魚 Wakasa no Ningyō) is a mermaid yōkai that appears in the sea of Wakasa.
Wakasa Mermaid resembles the traditional depiction of a Ningyō, being a large fish with the head of a human. She has green scales on her body with light blue skin on her face, two pairs of light blue fins, six spines protruding on her back, each becoming shorter the previous spine and a white underside that has a bubble-like texture with two pairs of leaf-like appendages. She has long purple hair, a pair of small, pale yellow horns on top of her head, sunken, black eyes with small pale blue pupils, her mouth has pink lips and is filled with small pointy teeth.
The Wakasa Mermaid appears in GeGeGe no Kitarō: Nippon Bakuretsu!! She is one of the chosen 47 Yōkai Warriors and represents Fukui Prefecture. During the battle against Yato-no-Kami, Yobuko calls for help from all over Japan, the remaining 47 Yōkai Warriors are revealed once their mark begins to shine. Among those are Waksa Mermaid, who looks her tail when her mark appears. Afterwards her power is sent to aid Kitarō in defeating Yato-no-Kami.
Due to the fifth anime adaptation's sudden cancellation at 100 episodes, she is among the 23 Yōkai Warriors that were not revealed aside from the movie.