1. Home
  2. Otapedia
  4. Hatsune Miku
  5. Kagamine Rin/Len (Vocaloid)

OtapediaKagamine Rin/Len (Vocaloid)

Kagamine Rin and Kagamine Len are VOCALOIDs developed by Crypton Future Media. They use the VOCALOID 2 and VOCALOID 4 singing synthesizing technology and are both voiced by Asami Shimoda. As with many other VOCALOIDs, they have performed in live concerts around the world using proprietary projection technology.
Rin’s name along with her twin brother Len's are derived from the concept of "left" and "right", as in stereophonic sound. Their surname, Kagamine, uses the two Japanese kanji characters "鏡" (mirror) and "音" (sound). Shimoda has said that she sang within her chest for Len's voice and sang at the top of her head for Rin's voice.


Rin and Len were initially developed by Crypton Future Media using Yamaha's VOCALOID 2. They were the second release in the "Character Vocal Series", which included other popular VOCALOIDs Hatsune Miku and Megurine Luka. Following Crypton's concept and direction, Rin's design was the first to be illustrated, followed shortly thereafter by Len. The software was released on December 27, 2007 and sold around 20,000 copies.
Due to numerous complaints about how difficult it was for producers to compose music using the twins, an independently package "ACT2" was released. those who purchased the original version were able to claim the updated "ACT2" until September 2008.
In 2010, "Kagamine Rin & Len Append" was released which provided additional styles of vocalization. For Rin, "Power", "Warm", and "Sweet" were included while Len had "Power", "Cold", and "Serious". This allowed for a multitude of cross-genres that the two could now sing along to, while still sounding natural.
"Kagamine Rin/Len V4X" was released for VOCALOID 4 on December 24, 2015. Slight modifications to the voicebank were applied, and Rin would now sing with the options "Power E.V.E.C.", "Warm", and "Sweet", while Len used "Power E.V.E.C.", "Cold", and "Serious". Enhanced Voice Expression Control (E.V.E.C.) is a new system developed for Piapro Studios. Rin and Len also received an English voicebank which was released on the same day as the Japanese voicebanks. The English versions are available separately as a download or as a bundle with the Japanese versions.

The Kagamine twins are popular for the casual appearance and short blond hair. Crypton Future Media initially supplied KEI with the concepts of the twins including the theme of them being "mirror images", them being androids, as well as their approximate ages. Rin was the first of the two to be illustrated. Len's design came after and was based on Rin's initial design.

On the day when the Kagamine Append package was released, it went straight to fifth place of total Vocaloid software sold in the year.

Character Information

Name: Kagamine Rin
Age: 14 years
Birthday: December 27
Height: 152 cm
Weight: 42 kg

Append Suggested tempo Suggested vocal range
ACT2 85-175 BPM F#3-C#5
Power 65-170 BPM F3-B4
Warm 60-160 BPM F3-B4
Sweet 55-155 BPM G3-C5
V4X Suggested tempo Suggested vocal range
Power 50-170 BPM F2-E4
Warm 50-160 BPM F2-C4
Sweet 55-155 BPM G2-D4
English 55-155 BPM G2-B3

Name: Kagamine Len
Age: 14 years
Birthday: December 27
Height: 156 cm
Weight: 47 kg

Append Suggested tempo Suggested vocal range
ACT2 70-160 BPM D3-C#5
Power 65-170 BPM A2-D4
Cold 60-160 BPM B2-C4
Serious 55-155 BPM A2-C4
V4X Suggested tempo Suggested vocal range
Power 60-170 BPM D2-D4
Cold 60-160 BPM E2-C4
Serious 55-155 BPM F2-C4
English 55-155 BPM E2-G#3


Although many of Rin and Len’s most popular songs are rock-oriented, they are also known to sing other genres, such as ballads, or pop. Some of their most popular songs include:

Song Title Year of Release Producer
Tokyo Teddy Bear 2013 Neru
Alice in Musicland 2010 OSTER project
Roshin Yuukai / Meltdown 2010 iroha
Gemini 2009 Dixie Flatline
Kokoro / Heart 2008 Travolta-P
Gothic and Loneliness ~I'm the very DIVA~ 2011 Narushima Takashi
Tengaku / Music of Heavens 2014 Yuuyu-P
Melancholic 2010 Junky
Amatsu Kitsune / The Celestial Fox 2012 marasy


Official website
Wikipedia (Hatsune Miku)
Wikipedia (Megurine Luka)

TOM Shop

Hatsune Miku