Who is Rita from The Ear, the Eye and the Arm and what is their importance?

Rita is General Matsika's oldest child. She is thirteen-years-old and completely normal for her age, meaning she is prickly around boys, self-obsessed and melodramatic. Although she is older than Tendai, Rita tends to follow her emotions rather than her common sense. She is quick to judge and voice her disapproval. She also has difficulty find anything positive to balance the fears she projects to other people and the world.