Sheele is an airhead, often losing her glasses or failing at any chores she trys to do due to clumsiness, however she is very kind and caring to her friends, willing to sacrifice her life for them. However, her attitude changes completely when she kills, becoming cold and impassive; she described it as having "a screw loose" in her mind, which makes her a talented killer. She believes that getting rid of the "society's trash" is the only thing she can do well, and therefore couldn't be considered useless.

She is shown to apologize to those she kills, often as a force of habit.