Virtual Character Encyclopedia

COKO

狐子

A KOKO-derived Musical Isotope with adjustable vocal expression. [1] [2] [3]

Format
Voicebank singers
Performance
Voice synthesis
Project market
Japan
First release / debut
Unconfirmed
Organization / project
KAMITSUBAKI STUDIO / Musical Isotopes

Biography

COKO is the fourth Musical Isotopes singing character and uses KOKO’s voice as source material. Its CeVIO AI product lets creators adjust expressive delivery. These are music-production controls, not evidence that the character chooses its own performances.

Reservations opened in October 2022, followed by the software release on January 25, 2023. The launch announcement counted twenty original songs already published, showing that COKO’s music project was underway before the product went on sale.

[1] [2] [3]

Milestones

  1. Singing software reservations open [2]
  2. CeVIO AI singing software released [3]

Sources

  1. Musical Isotopes — COKOAccessed 2026-10-20
  2. Musical Isotopes — COKO reservationsAccessed 2026-10-20
  3. Musical Isotopes — COKO releaseAccessed 2026-10-20

The twenty songs mentioned in the release announcement have not been individually audited. Product marketing is not used to establish priority for emotion controls. The earliest character reveal remains unverified.

Updated 2026-10-20