Kunikuzushi is cold and stern in personality, even callous at times; he is limited in emotional expression, has no likes and dislikes, and has no need for recreation. Kunikuzushi thinks of himself as Ei's(his creator) assistant, He is a firm believer of what he believes to be eternity — a place in which everything is kept the same, regardless of what goes on. However, he is logical and loyal by nature, trustworthy, and steady.