MikuLen

LenKu is the het ship between Hatsune Miku and Kagamine Len from the Vocaloid fandom.

Canon
Miku and Len are two characters from a voice synthesizer software called Vocaloid and neither Miku nor Len have any canon personalily or relationships, as they are only Vocaloids, so people can portray their relationship however they want.

Songs
Despite not being a romantic song, Len and Miku's most popular duet is ""Crazy beat", while their most popular romantic song is Nakimushi Kareshi, whre thy break up and part away, but Len remember sadly his memories with Miku. Many of their romantic song are about a kind of love triangle about them and Rin. The song Himitsu ~Kuro no Chikai~ started as a romance between Miku and Rin, but the love between an angel and a demon was forbidden, so Rin gived up her wing to a demon to become Len and be with Miku, and Miku eventually fall in love with Len, even though she was going to marry with another man. At the end Kaito, Rin's old partner, was sent to punish Miku for being with a demon, but trying to killing her, Len/Rin sacrificed their life giving their last wing in order to save Miku. In ReAct, Acute's sequel, Miku, who was sent to the hospital after trying to kill Luka and commite suicide, and here she meets Len and Len wants to help her, but Miku is notice that Rin was getting jelaus about their relationship and doesn't want to repeat the same history that she had with Kaito and Luka. When Rin was going to kill Miku, Miku finally reveal wath happend in Acute and warn rin not to make the same mistake as her, so Len ends up with Rin.

Fanon
Being Miku the most popular Vocaloid and Len the most popular masculine ones, Lenku is a pretty popular ship in the fandom, and although the ship originally wasn't as popular as RinLen or KaiMiku, with the passage of time the interest in the ship started to began until becoming one of the most popular ships in the community. They are often paired along with KaiMei, and it is rivalized against KaiMiku, RinLen and MikuRin.

Fandom
FAN FICTION

PIXIV

Trivia

 * Their titles for Kizuna ranking from Project Sekai are "Two like siblings", "The taste of the day" and "Good understanding person"