After first appearing in a trailer for the cancelled Kirby GCN, HR-D3 made its official debut in Kirby Mass Attack. Its attacks and color scheme are virtually identical to those seen in the trailer, meaning the robot was likely included as a reference to the cancelled Kirby game. Despite this intentional reference, however, its laser is inaccurate; the laser HR-D3 fired in the Kirby GCN trailer was blue while the laser it fires in Kirby Mass Attack is orange.