Karen has short brownish green hair, which cuts right above her shoulders and is slightly curled; notably, two of her bangs cross over each other on either side of her eyes. She has blue-green eyes behind her thin white glasses, and she wears the standard uniform of Hope's Peak Academy. Karen cared for her mother deeply while being somewhat weak-willed or easily manipulated, as she was driven to start the Student Council Killing Game after she found out something bad happened to her mother.