Rem (レム) is a maid in service of lord Roswaal L Mathers, alongside her sister, Ram. She is one of the main supporting characters of Re:Zero, with major roles in Arc 2, Arc 3, and Arc 7. During the first half of Arc 2, she also served as the secondary antagonist.

Rem has medium length sky blue hair that covers her right eye, large light blue eyes, and young features. She also has hair clips towards the left side of her hair, a flower-shaped ribbon on the same side of her hair, and a maid hairband. She looks nearly identical to her sister apart from her hair, eyes, and ribbon colouring. 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.

Emilia (エミリア) is the main heroine of the Re:Zero kara Hajimeru Isekai Seikatsu series. She is a Half Elf and a candidate to become the 42nd King of the Dragon Kingdom of Lugnica in the Royal Selection. Officially debuting at the very start of the series, Emilia is arguably the most important character in the series as most events somehow revolve around her.

Emilia is a beautiful Half-Elf with long silver hair and purple-blue eyes. She wears a white and purple outfit along with a white flower in her hair. Although she appears to be in her late teens, Emilia's chronological age remains unknown, though mentally she has been stated to be in her early to mid teens. Throughout the series, she has styled her hair in a variety of ways, as per her contract with Puck, the Great Spirit of Fire was the one who arranged her hairstyle.

When Emilia still lived in Elior Forest as a child, she had a different set of clothes, with the same colour pattern. She had a light green ribbon instead of her necklace, a different flower in her hair, and could be seen wearing a light-purple headband.