MIO5 is a character fromOjisan to Marshmallow.Her name is pronounced Mioko. "Ko" is one of the pronunciations for 5.Her nickname is Degasu-chan (デガスちゃん), because of her tendency to end sentences with "degasu".Her full name is Koumori Mioko (虹森 未央子). She is an illustrator at the same company asHige HabahiroandWakabayashi Iori.