Len Kagamine. Part of the Kagamine twins, though in actuality they are male and femal mirror images of each other. Lens and Rins voices are actually created from the same actress voice. For Lens she recorded on a deeper scale to sound like a boy. Len and Rin are 2 of the 4 vocaloids that SEGA and Yamaha do concerts for. The concerts were started as a promotional for the game SEGA had come out with featuring the vocaloids. The concerts feature Holograms and a live band. They are not really holograms in the way people would think, but merely prjections onto two glasses. Len is supposedly physically 14.