Hata no Kokoro is a menreiki youkai created by Hata no Kawakatsu. She hardly displays any emotion by herself, instead relying on her masks to do so. She was introduced as the main antagonist of Hopeless Masquerade, and later appeared in Urban Legend in Limbo and Antinomy of Common Flowers as a playable character. Originally, she stabilized herself by having each emotion hold their balance with each other, but losing the Mask of Hope caused her emotions to interfere with each other, causing her to go berserk in her introductory game. After the events of Hopeless Masquerade, she manages to stabilize her personality by developing a sense of self. (Source: Touhou Wiki)