Rem (Japanese: レム) is a fictional character from the fantasy light novel and anime series Re:Zero − Starting Life in Another World, created by Tappei Nagatsuki. She is voiced by Inori Minase in Japan[1][2] and by Brianna Knickerbocker in the English dub.[3][1] She first appeared within Volume 2 of the light novel, "The Road to Redemption Begins" in 2014 and made her anime debut in the episode "The Happy Roswaal Mansion Family", the fourth episode of the anime, in April 2016.

Rem is the younger sister of Ram and works as a maid for Roswaal L. Mathers and is a supporter of Emilia's faction. She initially and mistakenly accused Subaru of being a member of the Witch's Cult due to having the Witch's Scent which results in her killing him two times. However, after he managed to save her at the Elior Forest, she becomes infatuated with him, deeming Subaru as her "hero". Despite Subaru turning her proposal down, she remains to be one of his closest allies throughout the earlier chapters.

Rem has gone on to be, being ranked as the most popular female character in a poll conducted in 2016[4] and has become a fan-favorite within the anime, being consistently ranked in the Top 3 in popularity polls.[5] She has also won the "Best Girl" category during the 1st Crunchyroll Anime Awards and had an official special event dedicated to her and Ram.

Hatsune Miku (Japanese: 初音ミク), also called Miku Hatsune, and officially code-named CV01,[2][3] is a Vocaloid software voicebank developed by Crypton Future Media and its official anthropomorphic mascot character, a 16-year-old girl with long, turquoise twintails. Miku's personification has been marketed as a virtual idol, and has performed at live virtual concerts onstage as an animated projection (rear-cast projection on a specially coated glass screen).

Miku uses Yamaha Corporation's Vocaloid 2, Vocaloid 3, and Vocaloid 4 singing synthesizing technologies. She also uses Crypton Future Media's Piapro Studio, a standalone singing synthesizer editor. She was the second Vocaloid sold using the Vocaloid 2 engine and the first Japanese Vocaloid to use the Japanese version of the 2 engine. The voice is modeled from Japanese voice actress Saki Fujita.

The name of the character comes from merging the Japanese words for first (初, hatsu), sound (音, ne), and future (ミク, miku),[a] thus meaning "the first sound of the future",[2] which, along with her code name, refers to her position as the first of Crypton's "Character Vocal Series" (abbreviated "CV Series"), preceding Kagamine Rin/Len (code-named CV02) and Megurine Luka (code-named CV03). The number 01 can also be seen on her left shoulder in official artwork.