Though she resembles a young 12 year old girl, Mimi is actually over 37 years old. This being due to her having Systemic Hypoplasia, a condition that prevented her from physically-aging. She is hard-working as a result of the dismissal she is often subjected to due to her youthful appearance. She may be a bit strict, but ultimately has the best interests of those she cares about at heart. When in the face of trouble, she usually uses her youthful appearance to her advantage.