Ram (ラム/Ramu) and Rem (レム/Remu) are twin maids working for Roswaal L Mathers.
Ram has medium length pink hair that covers her left eye, large pink eyes, and young features. She is nearly identical to her younger sister except that her eyes slant upward slightly and has a smaller chest. She usually wears a maid uniform which she wears neatly.
Rem looks like a mirror reflection to her sister. She has medium length sky blue hair that covers her right eye, large light blue eyes, and young features. She also has hair clips towards left side of her hair, flower-shaped ribbon on the same side of her hair, and a maid hairband. She is nearly identical to her sister, except for her eyes. She usually wears a maid uniform, and since her chest is slightly larger than her sister's, she secretly changes the measurements to hide it.
Ram is seemingly self centered and does things at her own pace, however in actuality she maintains a distance from people to ascertain them. She believes that Roswaal is the greatest and no one else is as precious except for her sister Rem. She is slightly more outgoing in comparison to the generally taciturn Rem, who generally allows Ram to take the lead in their sisterly bond.
Rem tends to speak in a superficially polite manner and sometimes acts without thinking. She holds both respect to the point of worship and guilt toward her sister for an incident in the past.
Because of her respect and guilt toward her sister, she used to think of herself as inferior. After Subaru saves her, she falls deeply in love with him, becoming one of his most loyal followers. Rem will stick with him no matter what happens, even if Subaru rejects himself.
Currently Rem has had her name and memories eaten by Ley Batenkaitos, erasing her existence from the world and putting her in suspended animation.