Originally, Pookas were enemies in the game Dig Dug, but later became recurring characters in Pac-Man's games. A Pooka made its debut in a Pac-Man title in Pac-Man World, and Pookas first served as enemies in Pac-Man World 2.
In Dig Dug, Pookas idly walk around underground tunnels. They are capable of phasing through the terrain in order to get closer to the protagonist, Taizo Hori; in this intangible state, only the Pookas' goggles are visible. Taizo Hori can defeat Pookas by pumping them with air, causing them to inflate until they eventually burst.
As a Smash Run enemy
Pookas appear as enemies in Smash Run in Super Smash Bros. for Nintendo 3DS. They attack by ambushing fighters from underground or through walls, though their goggles are visible even when they are inside the terrain. When they attack, they do not deal any damage but are capable of disrupting fighters by knocking them over. When attacked they inflate until they pop, damaging nearby enemies. If they are not attacked while they are in an inflated state, they will gradually deflate until they return to normal.
As a moveset element
The Pooka trophy is exclusive to Super Smash Bros. for Nintendo 3DS.