She is manipulative and cruel, choosing to murder Rantaro and frame Kaede for his death all so that the killing game would not end due to the motive Monokuma presented at the time. She openly fooled her fellow "classmates" as a friend & comrade all the while secretly orchestrating the killing game and making sure that everything went according to the "setting" provided for them. She displays great skills in hiding her true personality and doesn't display it before she is revealed as the culprit.