From the Super Mario Wiki
The Light Tripper is Princess Peach's unlockable kart in Mario Kart DS. It is a light yellow, short kart and has a high hood with a low body. It has average speed, weight, and handling, along with high acceleration, low items. Conversely, the Light Tripper has the highest drift, the other being the Standard PC. Its acceleration is tied with that of the Shooting Star. Its weight is equivalent to the Dry Bomber.
The kart is unlocked for Daisy and Dry Bones as well when the player gets gold trophies in all Nitro or Retro Courses in 150cc, and becomes available for everyone else when gold trophies are obtained in every cup in Mirror Mode.
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