Onigiri

Onigiri is a real-life, Japanese food that, interestingly, appeared as an enemy in Wrecking Crew '98. It is a living rice ball snack, which can float through the air and jump very high. When it gets upset, it will often explode. Onigiri is the first secret opponent encountered in said game.

As it is an actual type of food, generic onigiri managed to reappear as a Food item in Super Smash Bros. Melee, where it healed 8% of the player's health. Another onigiri made a brief cameo appearance in WarioWare: Twisted! as one of the many various objects Dr. Crygor was forging into WarioWare's new tilt-sensitive gaming systems during the introduction to Wario-Man's stage.