Miyahara is a petite girl with large glasses who keeps her hair pulled into twin-tails.
Miyahara seems to fit her nickname of "class rep," at least when it comes to Manami, as she is very adamant about getting him to come to school on time and do his work. She even helped Manami talk to a teacher so he wouldn't have to repeat a year. Her serious personality causes her to become frustrated over Manami, who prefers avoiding work.
- Taking care of Bengalese finch (It's attached to her).
- Special ability
- Making bookmarks with pressed flowers.
- She has a pet bird.
- She daily writes in her diary and stretches before bed.
- She uses different-colored hair ties every day to match with the day.
- Miyahara's first name was planned to be revealed at the 42nd Summer Inter High, but it was only revealed on the Yowamushi Pedal 68.5 Official Fanbook III, released almost a year after the end of the 42nd Inter High arc.