A Piranha Plant, known as Packun Flower (パックン フラワー) in Japan, is an enemy almost always portrayed as a leafy, green stalk topped with a white-spotted red or green globe and sharp teeth.
Piranha Plants are large, carnivorous plants encountered throughout the Mario series; Piranha Plants are seemingly based-off Venus Flytraps, eating anything that approaches them. The head of a Piranha Plant is most commonly either red or green with multiple other colors. Originally, Piranha Plants were found exclusively in pipes, either darting-out and biting anything near or remaining still and spitting fireballs. Currently, Piranha Plants can be found both in and out of pipes and their fire-breathing ability is now rarely used.
In Super Smash Flash 2
As a special move
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The subject was confirmed by an official source, but is not present in the current version of the work bound to appear. Instead, it is meant for a future update. Any information is subject to change.
A potted Piranha Plant can be summoned by Waluigi as his downspecial move. When an opponent comes close to it, the Piranha Plant will bite at them, and opponents grabbed will then be thrown in Waluigi's direction. The Piranha Plant also has a hurtbox, allowing it to block certain attacks. After throwing an opponent, being attacked enough, or being active for a certain period of time, the Piranha Plant will go back into the pot and disappear.
According to developers, this Piranha Plant is Waluigi's pet, who is named Thaddeus "Chompers" DePlant.