Bullet Bill

Bullet Bill, known as "Killer" (キラー) in Japanese, is a recurring enemy in the Super Mario series. They first appeared in Super Mario Bros., and are characterized by their black, bullet-like appearance, typically with angry eyes and sometimes arms. Bullet Bills are usually fired from Bill Blasters and travel in a straight line at high speed, often towards Mario. In some games, they can also home in on Mario. Bullet Bills sometimes function as items, like in the Mario Kart series, where players can transform into one for a high-speed dash. They can be defeated by stomping in some games, but in others, they explode on impact. They come in various forms, such as Bull's-Eye Bills (Missile Bills) and the giant Banzai Bills. These Bullet Bill variations serve different roles in different games, ranging from simple obstacles to active attackers, adding a significant challenge to the gameplay.