Someone with a balanced personality, a feminine side, and while it's hard to tell, she cares for others in her own way, she's generally quite confident in her appearance. At first she is reserved and serious but after a while she shows her true "self" that can sometimes be somewhat sadistic, but even so she always ends up embarrassed after being flattered. Despite her high social position where she should already be Being used to flattery, Mayumi is embarrassed every time she is truly praised.