Mash and homunculus

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.[9] However, that smile 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 designed to have no personality whatsoever in order to facilitate the Demi-Servant creation process, but Roman encouraged her to begin expressing her own opinions, allowing her to begin forming a sense of self.

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 Ritsuka. Even before her Demi-Servant abilities manifested, she was devoted to the cause of Chaldea and sought to assist it however she can; when she is unable to participate in battle, she keeps a close eye on Ritsuka as a navigator. She does her best to hide her fear when in battle, and prioritizes keeping Ritsuka safe above all else. It has been hinted that she has romantic feelings for Ritsuka as she is often seen blushing when compared to a couple or getting jealous whenever their interactions with other female Servants get intimate or they show affection for Ritsuka (like the few times Ritsuka got kissed or were on a fake date[10]). Even Habetrot, both the Lostbelt version and the summoned version, can see how stong their feelings for each other are and consider Ritsuka the bride's prince making it her goal to help and support them. However, Mash's naivety means that she does not yet realize what those feelings are.

Mash is a big fan of detective stories, especially Sherlock Holmes.

You and Mash are defeated and being use by homunculus as Breeders.