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Yami Bakura, known as Dark Bakura in the manga and Japanese version, is the evil spirit of the Millennium Ring.
After Ryo Bakura came into possession of the Millennium Ring, his body became host to the spirit, allowing Yami Bakura to freely take control of Ryo. Yami Bakura is the longest running, and most prominent villain in the entire series present for nearly every season but does not act as the central antagonist until the final season.

Through his host Ryo Bakura, Dark Bakura played RPGs including Monster World with many people, though Yami Bakura turned the innocent sounding games into Shadow Games. As a Penalty Game, the loser often had their soul trapped in a miniature to be used as a Monster World non-playable character, leaving the victims' bodies in comas. Bakura often had to change schools as a result of this.

Dark Bakura in the first series anime.
After transferring to Domino High School, Ryo Bakura is picked on by Mr. Karita, a teacher at the school. Dark Bakura plays a Shadow Game with Karita, turning him into a miniature. That night, Dark Bakura talks to Bakura for the first time, telling Bakura that he is his new host and that he has his sights set on acquiring Yugi Mutou's Millennium Puzzle.

Yami Bakura in his game with Mr. Karita
Bakura sets up a miniature "Monster World" game, to play with Yugi, Katsuya Jonouchi, Hiroto Honda, Anzu Mazaki and Miho Nosaka. Bakura tries to warn his friends, and get them to leave, but Dark Bakura takes over and invites them in, while pretending to be Bakura.

Yami Yugi in his shadow game with Bakura
Each of the group picks a type of monster they wish to play as, and Bakura seals them inside miniatures of their selected monsters.
Ryo Bakura managed to emerge during the RPG, taking control of the body's left hand. Ryo Bakura intentionally fumbled several critical dice rolls, giving Yugi an edge in the game. Once Dark Bakura realized this, he impaled his good self's controlled hand on a tower spire of the game board's castle, laughing madly. Ryo Bakura then sealed his soul into a pair of possessed dice. He caused the dice to shatter, effectively ending the game, though killing himself in the process.

The good Bakura is dead when Dark Yugi reaches him. His avatar in the RPG is still animated, however, and White Mage Bakura uses his power as a level 13 mage to bring him back to life. When doing this, Dark Bakura is also placed back together with him.