Mai looked identical to her twin sister Maki Zenin, but with her hair cut shorter. She had mid-length black hair (dark green in the anime) that reached just to her neck with bangs swept to the right side, dark brown eyes and thin eyebrows.

Mai's school uniform consists of the traditional outfit. While training, Mai is shown wearing a long sleeve tracksuit with black sleeves and shoulders and a white body, along with black pants. As a child, Mai wore a dark kimono with a black sash. 