Asagiri (a Touhou LW original) refers to morning mist. This is an apt temperament for Wakasagihime since she lives in the Misty Lake. Wakasagihime is endowed with Water Phase, since mermaids can breathe underwater, and Sun Essence, as she harbors untold youkai power. The flexible and patient Water Phase resists Metal Phase, because metal collects water, but it is weak to Earth Phase, because earth directs water. The alluring and arrogant Sun Essence resists the diverse and uncooperative Star Essence, but it is weak to the cooperative and indecisive Moon Essence.

Wakasagihime's ability as a mermaid. This is an apt power for a water-dwelling youkai, but it doesn't really help her in battles of bullets since they are mostly conducted in the sky. Perhaps she is known as a gentle youkai because she is comparatively less powerful out of the water. There are many tales all over the world about the species known as mermaids. The most famous story is probably the fairytale about a little mermaid written by a renowned author. The ancient legends of mermaids depict them as beautiful, long-lived, otherworldy creatures in a similar vein to fairies. In Japan, the most famous mermaid tale is that of Yao Bikuni, which is about a girl who became a nun after acquiring immortality by mistakenly eating the flesh of a mermaid. There are legends where mermaid meat was served in other worlds like the Dragon Palace, and it is depicted as a type of panacea that grants eternal youth and longevity. Regardless of origin, tales of mermaids generally seem to agree that they are ephemeral creatures. Even in this modern day, the ocean remains a treasure trove of mysteries to the humans who live on land, and the water's edge is a barrier that separates these other worlds. Perhaps all beings who live on this barrier are ephemeral and delicate.