Boo (Mario franchise)

Boo is a character from the Mario franchise, created by Nintendo. They are ghost-like creatures that typically appear as round, shy, and often mischievous enemies. Boos are known for their transparency and ability to become intangible, making them hard to catch or avoid. They usually cover their faces and hide their eyes when looked at directly, but become playful or aggressive when players turn away. Boos often serve as obstacles or enemies in Mario games, contributing to the series' mix of platforming and puzzle-solving elements within haunted or spooky-themed levels.