TokuTenshi Colored blinking lights in the headset and arm panels gave my Vocaloid a little something extra. I included circuit boards as well (that I took from a cheap TV remote).
Zatsune is the dark version of Hatsune Miku and a fan creation. Since I was convention staff, it kind of paralleled my position - similar to the other Vocaloid cosplayers, but not really one of them.