Chishiya's father worked in the medical field in an unspecified specialty. They rarely chat because his father would spend his time in front of his computer among mountains of medical books. Chishiya also implies the purpose of his parent's marriage was to secure the top position in their hospital. Lacking parental love.

Chishiya has long, slightly messy light-colored hair and sharp features with a distinctive mole under his left eye. However, as the series progresses, his design gradually changes to be more prominent and dark.