Yugi Muto, spelled Yugi Mutou in the manga and Japanese versions, is the main character and protagonist of the original Yu-Gi-Oh! series, along with [Yugi]. Yugi is pure-hearted and child-like. He is good at games, riddles, and puzzles, especially Duel Monsters.

Yugi possesses the Millennium Puzzle, which allows his body to bear host to the spirit of the Puzzle, Yami Yugi. Yugi was initially unaware of his existence and control of Yugi's body would involuntarily shift to Yami, when Yugi or his friends are wronged.

He lives with his grandfather Solomon Muto and mother, although he never speaks of the latter in the English anime. In the manga, Yugi's father is living away from his family on business.[2]

Yugi is part of a close-knit group of friends: Joey Wheeler, Tristan Taylor, and Tea Gardner as well as Bakura and (In some cases)Mokuba Kaiba. Miho Nosaka is also one of Yugi's friends in the first series anime. Yugi's friends often cheer him on from the sidelines, and Joey has dueled at his side. Yugi has been friends with Téa since childhood yugi thinks of her as a friend. Téa has been shown to have feelings for both Yugi and Yami Yugi.

In Japanese, the first characters of "Yūgi" and "Jōnouchi" combine to form "Yūjō" (友情), which means "friendship". The "Yu-Jo Friendship" card is named after the word and the fellowship between the characters Yugi lived in his family's game shop, Kame Game, with his mother and grandfather. His grandfather taught him a lot about the game, Duel Monsters.