"MEIKO (メイコ) is a Japanese VOCALOID originally developed by Yamaha Corporation and distributed by Crypton Future Media, Inc.. She was one of the 4 known "Project Daisy" vocals.Her VOCALOID3 update was developed and distributed by Crypton Future Media. She was initially released in November 2004 for the first VOCALOID engine. There has since been a second installment developed for the VOCALOID3 engine, dubbed MEIKO V3. Her voice is provided by the Japanese female singer-songwriter, Meiko Haigō (拝郷 メイコ Haigō Meiko)."

"MEIKO's original release was aimed to be a professional and standard vocalist.[15] When MEIKO was updated, the voicebank had to be completely re-done with a similar tone to the original, thus some aspects of the vocal have changed in consequential versions. The vocal was also originally a counter-partner to the KAITO "Straight" vocal."