Hatsune Miku
A series of rhythm games starting from "" were produced by Sega under license using Hatsune Miku and other Crypton Vocaloids, as well as "fan-made" Vocaloids like Akita Neru. TinierMe also made attire that looks like Miku's for their services, allowing users to make their avatar resemble her. The series has sold 6million copies. "" was developed for the Nintendo 3DS. Miku's appearance in this game is based on the Nendoroid series of figures. Hatsune Miku is also briefly referenced in the game "Recettear", where a young man stargazing sees "The Green-Onion Girl" constellation. Also, in 2013, Saki Fujita voices Fei-Yen HD, a character based on one of Hatsune Miku's modules, in "Super Robot Wars UX"; this appearance does not use Miku's vocal library.
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.