Ningyo, is a creature with both human and fish-like features, described in various pieces of Japanese literature.
Japanese mermaid (ningyo). Coiffed with nihongami hairstyle of the Edo Period.— Santō Kyōden Hakoiri musume menya ningyō (1791)
The ningyo (人魚) aka ryōgyo (鯪魚; 'hill-fish') (cf. full image)
The Teijin (氐人), or the "Di people"
A ningyo (人魚), aka Teijin (氐人) or a Di countryman—Toriyama Sekien's Konjaku Hyakki Shūi (1781)
Amabie is a legendary Japanese mermaid or merman with a bird beak-like mouth and three legs or tail-fins, who allegedly emerges from the sea, prophesies either an abundant harvest or an epidemic, and
Ningyo
…immortal after eating their flesh. This includes Sato Shiranami, the true identity of Yao Bikuni, as well as the game's protagonist, Yuza Minakuchi. Amabie Fiji mermaid…
The amabie. Woodblock print, late Edo period, dated Kōka 3 (1846).
Amabiko seen in Higo, painting, property of Kōichi Yumoto [ja]
The STOP! Kansen Kakudai – COVID-19 is a poster by the Ministry of Health, Labour and Welfare.