Cause he has the millennium ring, and the ring has a dark spirit that lives in bakura's body.
Reshiram
OBVIOUSLY he is cute:3
over 5000 years ago
Yami Yugi wanted to defeat Yami Bakura because he was possessing the body of Ryou Bakura and wated to take over the world (or something like that).
Bah-koo-rah R(ee)-yoh [The 'Ryou' part is pronouced fast, so that the first syllable slurs into the second.]
In Japanese, it is written Ryō, which can correctly be transcribed as either Ryo or Ryou. Which one is used is down to personal preference.
To avoid confusion due to Japanese first and last names being given in reverse order to how it is written in the West, Bakura is his family name, his given name is Ryou.
In the show? No. He does, however, appear in the game "Yu-Gi-Oh!: Capsule Monster Colleseum".
He was given a British-sounding accent in the English dubbed version to represent the calm and extremely polite way he speaks in the Japanese original. He is not from the UK though, he is Japanese.
Well his evil dark side is but marik himself is also half evil
Bakura is the guy that has the Millenium ring who occasionly gets possessed by thief king Bakura
well, that's alot to say. i can start you off with a few, yugi mutou, yami yugi, joey wheeler, tea gardener, Tristan Taylor, ryou bakura, seto kaiba, marik ishtar, ishizu ishtar, rex raptor, weevil Underwood, yami bakura, shadi, mai valentine, jaden yuki, and and hopefully others will improve.