The Character Vocal Series singers are a set of Vocaloid products created by Crypton Future Media - Miku, Rin, Len, and Luka. And, in my opinion, the coolest of the Vocaloid singers. Appearance-wise, Rin Kagamine is my favorite - this used to be a Rin Kagamine collection - but voice-wise, I like Miku the best. But all four are awesome. In fact, I'll bet that all the Vocaloid singers, from Crypton and from others, are all awesome, but I've chosen to fixate on these four. :) I keep a list of my favorite Vocaloid songs. Behold!