Yumi's demeanor is not just like Ami's. She is sarcastic, cynical, vain, sassy, stubborn, and gained with self-importance. She loves things like ninjas and anything else rough and tough. She rarely signs in any excitement as "she is too cool" to show it. For some reason, she comes off as rude and insults others she sees as "not cool". Despite being similar in age group with and more serious than Ami, Yumi is also more impetuous than Ami and rushes headlong into a decision before thinking.