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The third Guardian Character, Su, represents Amu's desire to be more caring, sensitive and improve her domestic skills. However, Su is prone to silly mistakes. She is very fond of Amu's teacher, Yuu Nikaidou. Amu gains an improvement in cooking and sewing skills during Character Change, as well as becoming "too girly". During Character Transformation, Amu becomes Amulet Clover with an outfit just like Su's.

Source from Wikipeida