On July 27, 2015, several questions were brought up to VOCALOID EMPIRE's twitter account. UNI would have more than one voicebank and it was hinted that she may be able to sing in multiple languages.
On June 17, 2016, it was revealed that UNI would be bilingual in English but would release separately from the Korean voicebanks. The English voicebank was estimated to release in Spring 2017 while the Korean voicebanks were expected to release in September 2016.
It was later confirmed on November 16 that UNI's English voicebank would not be in development until her Korean Append voicebanks were released.