The Princess of the Mushroom Kingdom. Her long blonde hair is a perfect match for her pink dress. Regardless of the number of Toad retainers she has, she's often kidnapped by Bowser. Though she's usually the damsel in distress, she got a starring role in Super Princess Peach, where it was her turn to rescue Mario and Luigi.
(Source: Super Smash Bros. Brawl (trophy description))