Kokoro Hata is a character from the Touhou Project, a popular series of bullet hell shooter games. She is a menreiki, a type of youkai born from a set of 66 masks. As a tsukumogami, Kokoro is emotionally unstable and relies on her masks to express emotions. In the series, she becomes a central figure in the game 'Hopeless Masquerade' where she seeks to regain her lost emotions. Her character explores themes of identity, emotion, and the struggle for self-discovery.