Mao is the girl with pink hair who defends Japan from the ground by using a tank (the tank was officially named 'White Tiger,' but she refers to it as 'Mee-kun' for reasons unknown). As revealed in assorted Physical Education scenes, she is a very slow runner. Also, going by a statement she makes during the sports fest, she has no mother. Her clover pin is green.    (Source: Wikipedia)

Mao Onigawara is a happy 8-year-old grade-schooler and the granddaughter of Chief of Staff of Ground Defense Force. Equipped with her cloverleaf-shaped badge which enables her to transform (but gives her no special power whatsoever), Mao and her best friends (granddaughters of Chief of Staff of Air and Marine Defense Force, respectively) will defend Japan against the invasion from "cute aliens," who are way too cute to be dealt with regular armed forces.
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(Source: Anime News Network)

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Japan has been invaded by aliens&ndash;but this is no ordinary assault. These extraterrestrials are cute and extremely dangerous. Their mind-blowing powers are way too much for the military. Enter Mao-chan, the daughter of a great general, and her charming best friends&ndash;Japan&rsquo;s only hope against this massive attack of the adorables! (Source: Del Rey)