Yūgi Mutou is the main protagonist of the anime and manga series Yu-Gi-Oh!. He is a kind-hearted and shy teenager who enjoys playing card games, particularly the popular game Duel Monsters. Yūgi possesses a mysterious ancient artifact known as the Millennium Puzzle, which grants him the ability to transform into a more confident and skilled version of himself. When Yūgi transforms, he becomes the spirit of an ancient Pharaoh, often referred to as Yami Yūgi or Dark Yūgi. Together, they face various challenges and opponents in high-stakes duels, using their strategic skills to protect their friends and uncover the secrets of Yūgi's past.