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".