Niko Kuna

久南妮可 久南 ニコ（くな ニコ）

A female bureau officer wearing glasses. She is the younger sister of the former Ninth Division Vice-Captain, Niko Shiro. Perhaps because of her sister, she has a very responsible personality. She admires and affectionately calls Shiro "Shiro-oneechan," but she scolds Shiro when she comes begging for snacks or gives her New Year's money.