In the anime, it is revealed that Maira, a former Pawn, became a Bishop by gaining the &Auml;RM Vaqua. He is not given a backround in the manga. Maira is a black-cloaked masked man who takes pleasure in engulfing and digesting people with Vaqua. Vaqua is a blue/green slime-like Guardian &Auml;RM with one eye. Maira is first seen watching the War Game battle between Ginta Toramizu and Garon. During the second round of the War Games, Maira reappears as a fighter for the Chess Pieces. He has the last of the battles in that round, and goes up against Dorothy.  Maira is quick to falsely judge Dorothy&#039;s power, though he easily destroys one of her weaker Guardians and stalemates another. Dorothy, however, calls back this one to bring about her favorite, Toto, which eats Maira&#039;s Vaqua.    Maira, now &Auml;RM-less, begs Dorothy for mercy. Dorothy, however, doesn&#039;t do as such and has Toto eat Maira as well, becoming the first casualty of the War Games. 

Dreaming of a magical world every night, the young Toramizu Ginta yearns to be able to go there. With only his friend Koyuki believing in his dreams, Ginta remains positive despite the slander he receives from others over his dreams. But his wishes are answered, as one day a large door appears in front of Ginta, summoning him to the land of MAR Heaven. In this land, the weapons known as ARMS exist. While initially Ginta greatly enjoyed the discovery of this magical world, he soon learns of the terrible wars that have once plagued MAR Heaven and the upcoming war that may soon appear.

"He has recently left Viz Media due to low pay, and Kenpachi was subsequently recast."

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Ginta Toramizu is a 14-year-old kid who doesn't have a lot going for him: he's near-sighted, doesn't do well in school, sucks at sports, and to top it off--he's short! But Ginta is a dreamer and has had the same dream 102 times, always in the same fantasy world, where he is a hero blessed with all the abilities he lacks in real life.<br><br>
Then one day a supernatural figure appears at Ginta's school and summons him to a mysterious and exciting new world! In this strange universe filled with magic and wonder, he is strong, tough, agile--and he can see without his glasses! Thus, Ginta begins a mystical quest in search of the magical items known as "&Auml;RMS," one of which may have the power to send him home. Joining him on this epic journey are his companion Jack and the valuable living, talking, mustachioed iron-ball weapon known as "Babbo," which everyone wants but, it seems, only Ginta can possess!
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(Source: Viz Media)