The Dragonfly is an unlockable kart for Wario in Mario Kart DS that can be unlocked by completing the Nitro Grand Prix in 100cc along with all the other unlockable karts in the game. He has other two karts being the Brute and Standard WR.
This kart resembles a red tractor, and is the second heaviest kart only being lighter than the Tyrant, so its ideal for knocking into other karts. It's stats, except weight and items are all slightly lower than his other karts.
Luigi and R.O.B. have the option to use the Dragonfly once all cups in the 150cc Nitro or Retro Grand Prix have been completed. All characters can use this kart once all cups in Mirror Mode have been completed.