Kokoro Hatano is a character from the Touhou Project series, specifically introduced in the game 'Hopeless Masquerade'. She is a menreiki, a type of youkai born from the fusion of a hundred masks. Kokoro is characterized by her emotionless demeanor and the masks she uses to express emotions. Her role in the series involves seeking to understand emotions and regain her missing Mask of Hope, which is crucial for her emotional balance. Throughout the series, Kokoro navigates various challenges as she strives to understand and convey human emotions more effectively.