In the 2/01 issue of Arcadia magazine interview with game's character designer Kei Toume, she said that the sisters Romi & Limi were originally designed to be twins with oni (devil) horns in the story. The pair went through many design changes as Toume's team really wanted "some kind of memorable character accent with their hair".

The android Cherry, however, hardly changed from how they first imagined her, with Toume stating she probably went through the least amount of changes out of the game's cast of characters.