Piranha Plant is the first DLC character revealed for Super Smash Bros. Ultimate. It was released on February 15th, 2019.
These vicious, plantlike baddies are from the Super Mario™ series and typically hide in pipes. They emerge with mouths open, awaiting victims. A poorly timed jump means a chomping—hence the "piranha" name. While there have been exceptions, they generally don't appear if Mario waits on top of or just next to a pipe. They hate fireballs.