Hatsune Miku (初音ミク) is the first Japanese Vocaloid2 in the Vocaloid2 Character Vocal Series, the third Japanese Vocaloid created by Crypton Future Media, and is the seventh Vocaloid to have appeared overall; released on August 31, 2007. She is considered as the most popular and well known Vocaloid and the first to become a pop idol. The data for the voice was created by sampling the voice of Saki Fujita (藤田 咲, Fujita Saki), a Japanese voice actress.
Crypton had the idea to release Miku as "an android diva in the near-future world where songs are lost." When KEI illustrated Miku, he was asked to draw Miku as an android and a color scheme to go off of (based on YAMAHA synthesizer's signature blue-green color). Crypton also provided KEI her detailed concepts, however, Crypton says it was not easy to explain what a "Vocaloid" was like to him, and KEI says he could not create an image of a "singing computer" at first, as he did not even know what a "synthesizer" was. It took him more than a month.  The digital design on Miku's skirt and boots are based off synthesizer program colours and the bars represent the actual bars within the program, following Crypton's idea. Part of her design seems to be based on Yamaha's keyboard model DX-100 .