Though she is typically very friendly, she abstains from acting this way when she uses her perceptiveness to expose her classmates' cheating. Yumeko scaring Mary Saotome after the latter's loss Every time she notices an opponent cheating in games, her button gets switched to a bloodthirsty side of her, usually seen when her eyes turn red, and she frightens her opponents. She does just that on her very first day of school and manages to continue doing so on nearly a daily basis. Not only is she able to befriend those who previously disliked her, she is able to catch the attention of the entire student body.

Yumeko is shown to be a very upbeat and charismatic character who consistently attracts the affection or interest of people around her, usually making a big scene. Additionally, she wears a silver ring on her left thumb, which was one of parents' wedding ring. She wears the standard uniform issued to female students at Hyakkaou Private Academy: a red blazer with black trim lining the cuffs and collar, white button-up dress shirt and black tie, a black and grey checkered mini skirt, black tights, and brown loafers. In general she bears a striking resemblance to her late mother, and her older sister. Additionally, she has pink glossed lips and red painted fingernails. Yumeko is a tall, beautiful girl with a curvy figure, long thick black hair styled in a hime-cut and burgundy eyes as soon as she becomes thrilled, her eyes turn bright red.

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