Yuuka is generally polite, professional and easy to deal with if you treat her well. However, most of the people she interacts with in the story are very difficult to deal with, which leads to angry outbursts. This earns her a reputation as cold and ruthless, even though she really isn't. She takes pride in her mathematical skills to the point of stubbornly refusing to believe in the randomness of a poker game with Sensei, allowing easy manipulation. She will also try to cover up her own mistake