Horvy "Hammer D" David Grant races for the NA Astro Rangers, representing the United States in the World Grand Prix (WGP). He stands as the team's tallest and most muscular member. A deep passion for racing fuels him, yet he contends with nerves under pressure that can disrupt his concentration mid-race. He actively strives to improve his focus and build confidence on the track. His interest in baseball translates into a strong emphasis on teamwork, which he views as critical for the Astro Rangers' success.

Grant pilots a torque-focused variant of the Buck Blader Mini 4WD, embodying advanced American technology optimized for power and acceleration on demanding track sections. The NA Astro Rangers' racing approach hinges on precision, cutting-edge technology, and meticulously coordinated strategies, with each member contributing specialized skills. While strong personalities occasionally spark internal friction, team cohesion prevails during competition under captain Brett Astaire's leadership.