Miruchi  

In the middle of the series, Chiyo-chan had two grade school friends named Miruchi and Yuka who were separated when she advanced to high school. Despite this, they would occasionally meet on their way to school and share stories about their experiences. Near the end of the series, both Miruchi and Yuka had moved up to middle school and proudly displayed their new uniforms to Chiyo and Sakaki as they walked together. A closer look reveals that Miruchi resembles a younger version of Minamo Kurosawa (Nyamo), while Yuka is a younger double of Yukari Tanazaki. According to Absolute Anime.