As a pop-type idol, Kī is very cheerful and energetic. She has a habit of saying certain words twice or even thrice before ending a phrase or sentence. This is revealed to be an influence from her mother who would do the same. Kī states that her mother is "her producer", having been her main boat of support and confidence in her childhood.

Her voice sometimes has a little bit of a childish touch to it but it's kept to a minimum. Normally her voice is rather sweet and warm and medium-pitched. 

Voice sample: https://youtu.be/0PQFbkS6ELw