Dawn Summers (Michelle Trachtenberg)Dawn Summers is Buffy Summers' younger sister.Dawn is a typical little sister in the sense that she both idolizes and resents Buffy. She covets her older sister's clothes, make-up and amazing vampire slaying skills.She is something of a junior member of the Scooby Gang and idolizes Willow for her smarts and has a crush on Xander.Dawn herself is quite smart, if flighty in the way that bubbly teenage girls are. She doesn't always make the best decisions, which sometimes puts herself, her sister, and others in danger. Although Buffy is sometimes irritated by her, she is fiercely protective of Dawn.Although she is beloved by her family and friends there is something different about Dawn.