Kagamine Rin's male counterpart, he keeps his short blonde hair tied back in a tiny ponytail. His boyish voice has a power and firmness to it, but can also excellently convey a wide range of emotions. Len's appearance and looks are modelled after his V2 design made by KEI, who also made the V2 designs for Rin, Miku and Luka. He sometimes fights with Fukase, or Rin. He is canonically 14, same as Rin, Rin and Len's birthday is december 27. He is Childish, and likes bananas.