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King is a con man hired by Cartia to challenge Rio to a Gate Battle.
OriginKing is actually a con artist and not a dealer. Due to his physical strength, he can manipulate the outcome of guess which hand it's in games by crushing whatever object he is holding into powder without his opponents noticing. Te ability to manipulate the outcome of a match after it's already happened makes him an ideal candidate to take on Rio.
Major Story ArcKing appears during Rina's fake kidnapping to challenge Rio to a guess which hand the coin is in game. Sensing that he is a cheater, Rio decides to guess which hand the coin isn't in, which leads her to victory since King destroyed the coin before she ever spoke a word.