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Kagamine Len, better known as Len Kagamine (鏡音レン), is a Vocaloid and a Vocaloid2 voicebank sold as part of the Kagamine Append series developed and distributed by Crypton Future Media, Inc. He was released in December 2007 for the Vocaloid2 engine. An English counterpart named Len Kagamine English was released in September 2011.

Kagamine Len's voice is provided by a child voice actor under the pseudonym "Kamui Gakupo" (神威がくぽ). Len is a "power" vocal, specializing in rock, pop, and techno. He is designed as a 14-year-old boy with a high-pitched and clear voice.

Kagamine Len's personality is described as being cheerful and energetic, and he is often depicted as a mischievous and playful character. He is also known for being a bit of a ladies' man, and he is often seen flirting with other Vocaloids.

Kagamine Len has been used in a wide variety of songs, including "The Disappearance of Hatsune Miku", "World is Mine", and "Ievan Polkka". He has also been featured in several anime, manga, and video games.

In 2016, Kagamine Len was ranked as the top Vocaloid by Pixiv users, and he has been consistently ranked in the top 10 Vocaloids by Nico Nico Douga users. He is one of the most popular Vocaloids in the world, and he has a large and dedicated fanbase.