Do you think TKB is left or right handed? Or both? I know I should review the manga properly, but I'm having a hard time pinning it down.
The evidence: He tends to do major things with his right hand. I had the first volume of Millennium World next to me, and he's dragging in Akhnamkanon's corpse with his right hand, but gestures with both. In the anime, when Mahaado sacrifices himself, Bakura catches the Ring with his right hand. However, he does gesture with either hand as is convenient. (He gestures a lot.) I'm here thinking of the settei where he's doing victory signs with both hands (which is adorable).
Also, depending on your opinion on whether Yami Bakura is Thief King Bakura or not, YB also does things with his right hand. I'm thinking of when he licks the Eye, he's holding it in his right hand. And in Battle City, slicing open his left arm with his right hand. I think if he were left-handed, he'd have gone for the other arm.
My opinion: A successful thief needs to be, to some extent, ambidextrous. (Here I'm honestly influenced by the Queen's Thief series; Gen points out that he can use thieves' tools just as easily with either hand, but when Shit Gets Real, other characters note that his left-handed handwriting is legible, but shaky.) So I would headcanon Bakura to be basically right-handed with some useful ambidexterity.