Whacka

Whackas are a unique species of creatures to the Paper Mario series. One Whacka is found in each installment thus far.

Paper Mario
In Paper Mario, Mario finds one of these guys on Mt. Rugged. While scaling the mountain, he finds this creature hidden behind a yellow block. Each time Mario hits him, he obtains a Whacka Bump. This item is extremely powerful, but if Mario hits Whacka too much, he will no longer be able to obtain these delicacies for the remainder of the game.

Paper Mario: The Thousand-Year Door
TTYD adds the Whacka characters much later on. Rather than appearing in chapter 2 like in Paper Mario, Whacka appears in chapter 5 in this game. He is found on the western beach of Keelhaul Key, at the northern end of the beach. The same rules apply to taking the Whacka Bumps from Whacka.

Super Paper Mario
Super Paper Mario adds a small characteristic to Whacka, the bumps are a little weaker, meaning he isn't that great of a source of health like in the last games. Like in the previous game, Whacka appears in chapter 5. This means he appears in the Land of the Cragnons. He is found during the first half of the chapter. The bump that's obtained in this game can also be cooked, and make a special recipe, unlike in the two previous games.