omphalotus_japonicus
An original character by oso (toolate) that is a personification of the 'Omphalotus japonicus' (formerly 'Omphalotus guepiniformis') species of mushroom, also known as the tsukiyotake. It is a close relative of the jack'o'lantern fungus.
Her name is listed on oso's website and in his artbook as "Shizumine Tsukiyo" (静峰月夜.)