Talk:Touka Kirishima/@comment-79.20.55.196-20150918125817/@comment-79.20.55.196-20150918130945

Exactly.

Apparently the name of the character of Touka's mask appears in the article about the death of the investigator she killed. They commented how her mask seemed to be inspired by a character of the series zakki which is famous among high school girls and which is called, as said, Kachikachi.

This would add more meaning to the choice of her mask by Ishida.