Rem is a prominent character in the anime series 'Re: Zero kara Hajimeru Isekai Seikatsu'. She is a blue-haired Oni maid who works alongside her twin sister, Ram, at the Roswaal mansion. Known for her polite demeanor and exceptional combat skills, Rem initially harbors distrust towards the protagonist, Subaru, but eventually becomes one of his most loyal allies. Her character evolves from a reserved and somewhat insecure individual to someone who is deeply caring and supportive, playing a crucial role in Subaru's journey throughout the series.