Mash is a mysterious, kind-hearted girl. She refers to Ritsuka Fujimaru as her senior (先輩, senpai?) even before Ritsuka becomes her Master, feeling that something about them is especially easy to relate to. As she has spent nearly all of her life in an isolation chamber within Chaldea, she is somewhat naïve and lacking in worldly experience. Despite this, she knows about a wide variety of subjects due to her education via Sheba, and she is especially knowledgeable about historical figures.