Kagamine, Len

鏡音レン

At 14 years old, Len shares twin vocals with his sister, Rin Kagamine. Their portrayal varies—whether as siblings, lovers, mirror images, or otherwise—depending on the viewer or the song.
As a character from the second entry in Crypton's Vocaloid Character Voice Series, he is voiced by Asami Shimoda.
Released on December 27, 2007, Kagamine Rin/Len constitutes the second installment of the Vocaloid2 Character Vocal Series. Their surname was formed by combining "kagami" (mirror) and "ne" (sound). According to Asami Shimoda, their given names, Rin and Len, were based on "right" and "left." She later confirmed in an interview following the Append release that the names actually derived from Ken and Rin in *Hokuto no Ken*, stemming from a discussion about names familiar from her childhood.
According to Vocaloid's official blog, the package contains two voice banks: one for Rin and one for Len, both provided by voice actor Asami Shimoda. Despite including double voice banks, the package sells for the same price as Hatsune Miku.
He makes several cameo appearances in anime: in *(Zoku) Sayonara Zetsubou Sensei*, the two (standing in line, recolored blue and red) audition to be the voice of Meru Otonashi; in *Hyouka*, he appears as a cosplayer (with brown hair); and in *Shinkansen Henkei Robo Shinkalion*, alongside other Crypton Vocaloid voicebanks.
Alternative names/personalities:
Aku no Musume: Allen Avadonia/Servant of Evil
Akujiki Musume Conchita: Pollo
Kokoro: Otsu
Shuujin to Kamihikouki: Number 420