Rem is a character from the popular anime and light novel series Re:Zero - Starting Life in Another World. She is a half-demon maid who works at the Roswaal mansion and is known for her blue hair and distinctive horn. Rem is devoted to her sister, Ram, and has a strong sense of loyalty and duty. In the story, Rem develops feelings for the main character, Subaru Natsuki, and plays a significant role in his journey. Her character is often praised for her depth and emotional struggles, making her a favorite among fans of the series.