In the dub, Jack has a British cockney accent. He pronounces words like "little", "better" and "settle" as "lit'l", "bet'r" and "set'l" and words like "I" "my" and "me" as "ai", "moi" and "mei". He also makes puns on biking. Jack's personality is similar to Seto Kaiba's; he is somewhat cold-hearted, and often acts as an anti-hero. Jack is an arrogant man at the beginning of the story who thinks of his opponents as little more than entertainment for himself and his audience. As King, he believed in a pursuit philosophy; where that he would drive himself into his own pinches only to crush his opponents with his absolute comeback strategies. However, after losing to his former friend Yusei, Jack realizes what he's been missing as King and decides on starting his own journey to becoming a real Duelist. Upon meeting Carly Carmine, he realizes the error of his ways, and tries to repay Yusei and the others.