Mizuki is described as a timid-looking girl who wears eyeglasses. In their era, it is rare for girls to wear glasses because a vision correction procedure is already widespread. Tatsuya correctly inferred that her glasses were to reduce her over-sensitivity to Psion energy, allowing her 'crystal eyes' to even perceive the hidden aura and the exact nature of spirits. She also has very large breasts and a curvaceous figure.