Rose

A mature and calm undead maid, as well as the oldest employee of the company, often acting as a sort of big sister or mother figure to the other two. Very knowledgeable about a wide plethora of topics and a connoisseur of good alcohol. She's also hopelessly infatuated with her boss.
As a human, she was known as Mira, a governess. She met her demise after her mother got brainwashed into sacrificing her by a cult, however she was brought back to life by her current employer, who was furious at the idea of a group of serial killers murdering innocent people in his name.