Her design and original concept came about with the release of the "galaxias!" musical unit, being part of the promotional material related to said project. "galaxias!" is composed by the producer DECO*27, the DJ Teddyloid, and the voice actress and singer Kou Shibasaki, being the latter the one who come with the idea for galaco. Although it hasn't been stated, it's evident that galaco was designed to follow the same galactic concept used on galaxias!, as it's reflected on her attire design and name.