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Character:

Haruhi is the title character and leader of the SOS Brigade, whose energetic and eccentric character proves to be a driving force for the series. She has a mind for adventure, which often leads her subordinates to be swept into her plans. While smart, beautiful, and energetic, Haruhi was set as an oddball ever since Middle School; She had set all the desks from her classroom out into the hallway, painted stars on the roofs, and even painted a huge hieroglyph out in the school field. 

Source from Wikipeida