Piranha Bean

The Piranha Bean is a Beanbean Kingdom sub-species of Piranha Plant that somewhat resembles a smaller version of Petey Piranha, except with the head of a normal Piranha Plant.

The Piranha Bean is one of the bosses in Mario & Luigi: Superstar Saga found near Beanbean Castle Town. It must be fought so the Mario Bros. could get a bean fruit which would get them the Beanstar piece in the Yoshi Theater, and Luigi must be separated from Mario to find it. While looking for Bean Fruits, Luigi found out that one of those had been swallowed by the Piranha Bean, and had to fight the irate plant so as to get it back.

During the battle, the Piranha Bean shoots small fireballs at the plumber. The boss can attack from various spots on the battlefield, which makes his attacks slightly harder to dodge. After the end, Luigi discovers that Prince Peasley too was swallowed by the Piranha Bean, and was shrunk to a very small size (the Piranha Bean itself sometimes uses the prince as a projectile during battle).

In Mario & Luigi: Superstar Saga + Bowser's Minions, multiple Piranha Beans are found in the Minion Quest: The Search for Bowser mode as enemies. They are first encountered in the level Hunger Pains, where one of them bites Captain Goomba at the beginning of the level. They are Ranged troopers, and attack by spitting fireballs at their enemies. Their special attack is Spitfire Fury, which allows them to spit multiple fireballs at a targeted enemy. After the level, Captain Goomba finds a Piranha Bean watching him, and, after spotting Peasley (whom he had a rather unpleasant conversation with at the start of the level), makes the Piranha Bean spot Peasley, telling it how tasty Peasley looks, revealing Captain Goomba as the reason why Peasley was eaten by the Piranha Bean.

Trivia

 * Unlike most bosses, Piranha Bean's battle music is that of a normal fight with an enemy, though this may be due to the fact that it only fights Luigi.
 * Piranha Bean has a battle script for both Bros, despite only being fought by Luigi.