 toi8 was initially asked to work on the series' character designs, but the job was passed on to Tomomi Ozaki due to time constraints.Ozaki noted that Furuhashi requested that the characters "should not look like manga characters or too real; and not too anime-like," and that he wanted the designs to be faithful to historical details.She said that she sometimes referred to historical portraits from the series' time period as reference for her designs, and also cited specific sources for her designs.