Koharu is a young Japanese woman.  At just 152 cm and weighing in at barely 45 kilograms, she is small in almost every possible sense of the word.  She tends to be quiet and polite, calm even when everything around her is chaotic.  Her clothing is unfailingly crisp - usually a black blazer over a white blouse with pearlescent buttons, with a matched black skirt and pumps.  Her jewelry is generally confined to earrings, though she will occasionally include a pendant or bracelet when circumstances call for it.  Her hair is long, but virtually always kept pulled tightly back and neatly styled.