Yihwa sports straight black hair often held in place by her hairband which has the symbol of the Yeon Family.

Yihwa appears to dislike being accused of being traitorous. Also, she's rather naïve, and she's generally hot-tempered. She is insecure over her powers, leading her to call herself a defective product as a member of Yeon Family who couldn't control her powers. She seems to be quite proud of being a member of the Yeon Family, as well as having a nice, appealing body (in her opinion).