Miki is portrayed as beautiful young woman with shoulder length blonde hair and blue eyes. She is also very curvaceous for her age, sporting the biggest bust out of all the girls in class 5-3.
Possibly the greatest troublemaker in Nūbē class, Miki is well known for her big mouth and gossipy nature. At the start, Miki was a mere tattletale, consistently chatting on and on about various rumors and such, especially if Nūbē was involved. But after a near-fatal encounter with a tattletale yōkai that first pinned blame on her for several downright hurtful rumors and then attempted to eat her, she begins to tone down her talking and starts focusing on more spiritual matters. Miki begins to do consistent research on various spirit and yōkai manners, to the point where even her teacher came to her for things he may not know. Most of this is merely knowledge, she consistently looks for supernatural means to assist her, either for her rumor mill or to get rich quick. One of her most important spiritual developments was gaining the ability to become a rokurokubi, where she can spiritually stretch her head and neck to go undercover to anywhere she chooses. Extremely vain about her physicality, Miki prides in her growing buxom figure (she grows from a B-cup to an F-cup over the course of the series) and flaunts it whenever she can.