 The color schemes for the characters were decided upon by color designer Idumi Hirose.Due to the constant changes in time and location throughout the series, Hirose said that they sometimes had to use 20 to 30 different color schemes for each character in a single episode.Furuhashi requested that the "color trace" method, a coloring method wherein the solid black outlines are replaced by colored outlines, be used on the clothing of aristocratic female characters.