galaco is the image character of "galaxias!", a music unit consisting of Shibasaki Ko (Japanese actor and singer), DECO*27 and TeddyLoid.
Her VOCALOID voicebank was developed based on Ko's voice, and released for the VOCALOID3 engine by the YAMAHA Corporation. She was disturbed first as an exclusive prize vocal and later commercially for Mac and PC. She also has a speech voicebank that runs on AITalk, the same engine used by VOICEROID.