Natsumi had demonstrated extreme egotism and smugness upon her introduction to the rest of the Reserve Course students. Natsumi was described as a mean and egotistical girl who would plant hatred towards someone she dislikes or envies. Natsumi is also said by her parents to be much more violent than her brother and more worthy of being the Yakuza heiress. She is self-centered, selfish, and extremely arrogant. However, she had a subtle way of making people do what she wanted.