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Ryo Bakura (獏良 了, Bakura Ryō?) is a fictional character and the main Antagonist in the manga and anime series Yu-Gi-Oh!. In the English Duel Monsters anime, he is known as simply Bakura, and in the English Yu-Gi-Oh! The Eternal Duelist Soul video game, Bakura's name is given in the traditional Japanese order and is rendered Bakura Ryo.
Introduced as a new exchange student early on in the series, Bakura quickly befriends Yugi Muto and his friends and remains their friend for much of the series. However, Bakura possesses the Millennium Ring, an ancient Egyptian artifact that, unknown to Bakura, houses an evil spirit that plots to steal Yugi's Millennium Puzzle and becomes a major antagonist during the Memory World arc. Eventually, Bakura's good side is almost entirely suppressed and he is continuously controlled by the spirit, except in rare moments where he is separated from the Ring or able to overpower the spirit.