Len Kagamine is the second vocaloid, along with Rin Kagamine, in Crypton Future Media's 'Character Vocal' series, including Miku Hatsune, Luka Megurine, and and unnamed CV04.

Given that the program has two separate voicebanks, Rin and Len Kagamine still sell for the same amount as Miku Hatsune; approximately $200 USD.

Rin and Len were first released December 27th with an ACT1 that was of terrible quality. Crypton quickly released an ACT2, and gave users who purchased ACT1 the new ACT free of charge. ACT2 is no longer sold.

Len is due to get 3 appends, Moody, Soft, and Power, December of 2010, and a possible english update, if Miku Hatsune's English update sells well.

Len has many squealing fangirls. We know that his proven 'biggest fangirl' goes by the name of 'Luna' or 'Krystal'.

He is most often paired with KAITO or Rin, as far as VOCALOID go, and is paired with Ichine Luna as far as UTAU go.

Despite popular belief, Len's name is spelt as it is on the box, 'Len Kagamine', not Ren. Rin and Len's names are puns on Right(Rin) and Left(Len). The spelling is important.

The Nussy, or the “nose pussy”, if you will, was discovered during the corona virus pandemic of 2020. People that had to be tested for Covid-19 had to have their nose swabbed right where the brain connects, which often led to people rolling back their eyes and gagging.

A nose-swab-fetish developed from this, because we, as humans, ruin everything.

len is a very commonly used word in Gravesend to describe someone that is very stoned

A homosexual man that is a great friend, lover, and video game player. He has a big dick too.

A shortened nickname for Kagamine Len (鏡音レン), a character from the Japanese singing program, Vocaloid. Also called Ren or レン. He is mainly considered a shota and is often thought of as being a homosexual. He is also far more frequently depicted along with his twin sister / mirror reflection, Kagamine Rin (鏡音リン).

Len has a large fanbase of squealing fangirls and dies frequently in Vocaloid PVs. He is often paired with other male Vocaloids by the will of these fangirls.

There is a large debate among Vocaloid fans about whether Rin and Len are siblings or mirror reflections. This is rooted in the fact that in the actual Vocaloid program, Rin and Len come as a set and have the same voice actress, as well as the claim that the creator made an announcement that "Rin and Len are not twins, and are in fact mirror reflections". Also, their last name, "Kagamine" is translated as "Mirror-sound", as well as their names "Rin" and "Len" meaning "right" and "left".

A shortened version of the male first name Leonard.

Greatest guy you will ever meet, but you have to get to know him, nickname is King Ding-a-ling.