|Occupation||Elementary school teacher|
|Unusual Features||Huge fan of Yūki Saibai's manga|
|Manga Debut||Chapter 54|
|Anime Debut||Motto episode 2|
Haruko has brown hair and red eyes and wears a pair of glasses.
The most known aspect of her personality is that she's a huge fan of manga, specifically the work of Saibai Yuuki, who happens to be the father of Mikan Yuuki, whom she considers to be her top student in her class.
She made an appearance in Mayoi Neko Overrun! chapter 4 when the Stray Cats Association Club were looking for the owner of a lost cat (which was her).