Sunako is a young, playful girl, calm, humble, She enjoys reading books and mentions that she enjoyed reading Seishin's work while cooped up indoors. Despite her appearance, she displays knowledge that a child her age would not possess and exhibits some levels of religious affiliation, especially on death.

In truth, Sunako is the leader of the shiki and the one of the oldest of this group. She is mature and understanding, she's doesn't tell any humans that she is a shiki or admitted 