The Heckler & Koch G36C is a select-fire assault rifle and variant to the G36 Series of assault rifles. It is designed and manufactured by the German manufacturer Heckler & Koch and designed back in the 1990s. This variant is a much shorter version of the original weapon and proves itself with both maneuverability and accuracy.
The Heckler & Koch was seen throughout the entire mini-series known as Mario Warfare. It is seen in the hands of many Shy Guys and during Smash Club's preparation for battle, Kirby was deciding between a black or pink G36C. He obviously went with the pink one due to him being pink.