Kagamine Len is a Japanese VOCALOID developed and distributed by Crypton Future Media, Inc., and was released for the VOCALOID2 engine. He is the second of the Character Vocal Series together with Kagamine Rin and is an official PIAPRO character.
His counterpart is Kagamine Rin. Their relationship (whether they are siblings, lovers, etc) is officially left ambiguous and left up to the user to decide.
He is voiced by Shimoda Asami. He was originally designed and illustrated by KEI for his V2 voicebank. His V4X voicebank follows a similar outfit with readjustments designed and illustrated by iXima.
