Is Len a girl Vocaloid?

Kagamine Len (or for western fans, Len Kagamine) is one of the two male Vocaloid provided by Crypton and is a beginner favourite to many. His voice, along with his counterpart Kagamine Rin, is provided by Asami Shimoda who is a Japanese voice actress and singer.

Is Rin and Len the same?

Since the only canon describes Rin and Len as mirror images of the same person, some songs also describe them as gender bender versions of the same person. For example, one of MikuRin’s songs is about how Rin turns into Len in order to get a chance for a relationship with Hatsune Miku.