(I'll be honest, she's my waifu, but I can't come up with any headcanons for her ;-;)
Kokoro has a huge interest for operas and musical theatres. Through one of the books that was gapped into Gensokyo by Yukari and was placed in the library afterwards, she has access to all possible knowledge about musical theatres and operas. Her most favourite interests are in Japanese plays, like Noh, Kabuki, or Rakugo. She often performs in for entertainment of the Human Village or the entire Gensokyo to see. She has also a knowledge of 'wayang' (a traditional play in many forms, such as using humans as performers. Can be found in the land of Indonesia). She has found a slight interest in it, especially the "Wayang Orang" form, due to the fact it uses real people as performers and wears makeups or masks to hide their identities.
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Touhou Headcanons!
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