wakasagihime
The "Mermaid Living In Fresh Water." Stage 1 boss of Touhou 14, Double Dealing Character.
A timid mermaid who lives in the Misty Lake.
She along with Imaizumi Kagerou and Sekibanki are part of the grass root youkai network.
She has visible breasts in her official art which has caused many artists to exaggerate their size in fanart.