Mayumi is a relatively shy woman who lives with her parents and works in her grandparents' restaurant, often keeping to herself. Due to her looks, most are often intimidated by her, but she's a gentle giant at heart and wouldn't hurt a fly. Even so, she doesn't tolerate bullying, mostly towards those who cannot stand up for themselves.
Mayumi's family is a weird one. She is half Brazilian and Chinese but also half human and half fox because her Chinese father and his family are anthropomorphic foxes, while her Brazilian mother and her family are human. Her father's side of the family are Huli Jing (Fox Spirits), with the ability to shape-shift and perform magic - their true forms being normal foxes. As far as she's aware, she has no magical abilities of her own except for natural fox instincts.