Saki is a short girl, being a little shorter than Hinomaru. She has black hair cut in a bob reaching her neck, with some shorter locks covering her forehead.
Despite her serious face, she is a bit of a troublemaker, especially during high school. Later on, after the time skip, she seems interested in the development at Shibakiyama stable, and regularly meets with Reina and Hori.
She idolizes her brother, sometimes getting into trouble with him by not using proper titles with him.