Thread:ClarentBloodArthur/@comment-5688420-20190226154100/@comment-5688420-20190301175834

Kyoko remains uncredited for her early episode appearances, only getting a mention in the credits as soon as the reveal happens. Minori Chihara and Erika Harlacher can use far different tones of voice as Nana and Kyoko.

Sket Dance did a similar thing with the Switch Off episode... which I wouldn't elaborate further. You have to watch the series to find out.

Fun Fact: Switch Off is the episode that gave us this pic of Switch crying his eyes out: