Yuka  

In the middle of the series, chiyo-chan's friends miruchi and yuka were grade school students who would occasionally meet on their way to school to share stories about their experiences. although they were separated when chiyo advanced to high school, they proudly showed off their new uniforms to her and sakaki near the end of the series. it is worth noting that miruchi resembles a younger version of minamo kurosawa (nyamo), while yuka bears a striking resemblance to yukari tanazaki's younger self.