- Voiced by: Mel Blanc
- Catchphrase: "Roger dodger!" and "Va-room-a-zoom-zoom!"
- Cool Car: He is a dune buggy that can transform into a Submarine and a Helicopter. Also, he never lost a race he was in despite competing against race cars.
- Lovable Coward: Though he can come off as cowardly at times, he is well-meaning. Although for comparison's sake, Speedy braves us far more often than Scooby Doo did.
- Nice Guy: Speed Buggy is generally friendly and good-natured.
- Sentient Vehicle: He is a talking car.
- Voiced by: Phil Luther Jr.
- Voiced by: Arlene Golonka
- Girly Girl with a Tomboy Streak: Debbie is not above some stereotypical girly behaviors but let that not distract you she hangs out in a garage with boys and a talking car and has no problem going head on into danger with some sass on the side.
- The Leader: Debbie is actually the leader of this group despite being the only female. The boys usually go along with her instructions. This is even lampshaded in the Amazon episode where the Amazon leader insists now Debbie can tell the men what to do, which Mark and Tinker try to explain sometimes they are lucky to get a word in edgewise.
- Nice Girl: Generally a good natured girl.
- She's Got Legs: While Debbie is usually drawn in pants, in the Amazon episode, she proves she can compete with the other HB girls.