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).
Hiyama Kiyoteru
Silhouettes for the AH-Software Vocaloid 2 vocals were revealed on a poster on November 6, 2014; however, it was unconfirmed what they were for at the time. On November 20, it was confirmed in the livestream for Vocaloid 4 that they all, with the exception of Tohoku Zunko, would receive updated vocals for the new engine. Kiyoteru's new vocals were recorded from scratch to improve his upper and lower ranges. Kiyoteru was confirmed to receive a "Natural" and "Rock" vocal for his Vocaloid release, allowing him to make use of the cross-synthesis feature in Vocaloid 4.