Hatsune Miku
, sometimes referred to as Miku Hatsune, is the name of a Vocaloid software voicebank developed by Crypton Future Media and its official moe anthropomorph, a 16-year-old girl with long, turquoise twintails. She uses Yamaha Corporation's Vocaloid 2, Vocaloid 3, and Vocaloid 4 singing synthesizing technologies. She also uses Crypton Future Media's Piapro Studio, a singing synthesizer VSTi Plugin. She was the second Vocaloid sold using the Vocaloid 2 engine and the first Japanese Vocaloid to use the Japanese version of the Vocaloid 2 engine. Her voice is modeled from Japanese voice actress Saki Fujita. Miku's personification has been marketed as a virtual idol and has performed at concerts onstage as an animated projection (rear cast projection on a specially coated glass screen).
Megurine Luka
Megurine Luka was originally designed to be the first Vocaloid of the "Character Vocal Series" that Crypton Future Media would release and was going to be called "Hatsune Miku", designed to be capable of singing both English and Japanese vocals. However, the concept was put on hold and the name was used for another character, making Luka the 3rd vocal of the "Character Vocal Series" to be released instead.