Cappy is a character from the popular video game series called Super Mario. He first appears in Super Mario Odyssey as a sentient hat that Mario can throw to capture and control various creatures and objects. Cappy is designed to help Mario on his quest to rescue Princess Peach from Bowser. Cappy has a unique ability to transform into different hats, allowing Mario to gain new powers and skills. This gameplay mechanic adds a layer of strategy and creativity, as players can use Cappy to solve puzzles and defeat enemies throughout their adventure in various worlds.