He claims that he is Jewlie's little brother and the older brother of both Falulu and Gaaruru.
Koroko has a hairstyle, similar to Junon but his bangs are combed to the left and his hair is green like Falulu. He wears head phones that pretty much glows even if not cyalume changing. Koroko has green eyelashes, similar to Falulu and Jewlie. He also has cyan eyes.
Koroko is a very mysterious vocal doll. he is shown to be at Nini's side everyday. he evolved after he and nini snapped tickets (which was koroko was thankful for)
Falulu Vocaldoll - She is Koroko's little sister.
Gaaruru - She is Koroko's little sister
Jewlie - Koroko's older sister
Janice - Koroko's middle sister
Miyumi Koyuki - are both part of the unit "live parajuku party"
Nini Kaname - his first friend in PriParis
- Koroko is the second male Vocal Doll (after Akihiko Bokerdole) and the first to use Rosette Jewel as his brand.
- Due to being jewlie's little brother, koroko may be a demigod