Mash wears an armor and a shield made out of iron.she also carries a sword in a scabbard attached to her waist, but she has never been shown actually using it. Instead, she fights with bashing and slamming strikes from her shield. Mash's shield grants her and her Master Anti-Filth/Poison protection capable of nullifying the Demonic Fog

Mash is a young woman with short lilac hair, lavender eyes and fair skin. Her figure is fairly athletic, and her breasts have elicited comments from several other Servants about her physique and have also garnered her the nickname "Mashmallow". As a byproduct of her Demi-Servant augmentation preserving her body at its peak physical condition, she will continue to appear as if she is a young woman regardless of her chronological age..

Mash often fears that her Demi-Servant state makes her inferior to true Servants, and until she learned how to use her Noble Phantasm she thought herself to be all but useless to the master.

However, despite displaying a smile , it belies a deep sorrow and resolve that has accepted her fate as a person with a set life-span since day one. 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. Mash was initially designend to have no personality whatsoever in order to facilitate the Demi-Servant creation process, but Romani encouraged her to begin expressing her own opinions, allowing her to begin forming a sense of self.

Mash sighed as she continued eating a sandwich at the cafeteria.