Before arriving in the Borderland, he was a medical student. Manipulator, calm, analytical .Very smart. Chishiya is mostly seen sneering even when he is angry unless he becomes emotional or regretful, which occurs only a few times.He can get attached, for example, to Kuina Hikari, but often does not understand these feelings. Interested in the user. (A mix of manga and TV series. It is a reference to the Cheshire Cat from Alice in Wonderland.)