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As she is required to remain first in her class to keep her scholarship, her studies are very important to her.
Before Haruhi attends Ouran Academy, she's described as a pretty girl as seen in flashbacks when she had long hair and wore a girl's uniform.
Being unable to afford the expensive Ouran uniform, she wears shapeless, baggy clothing.
After Haruhi leaves for America, she grows her hair out until it reaches its original length and she keeps her hair long throughout college. In Japanese culture, this signifies life and romance, an apt color for the heart and lifeblood of the series.