Yuma Tsukumo (九十九 遊馬, Tsukumo Yūma) is the main protagonist of Yu-Gi-Oh! ZEXAL. He is a young Duelist who aspires to be the greatest, despite his amateur skills. He finds himself reluctantly partnered with a Dueling spirit called Astral. Together, they pursue the "Numbers" to recover Astral's scattered memories, becoming a Number Hunter while cultivating his Dueling abilities during their adventures. After being victorious in the World Duel Carnival, Yuma became the Duel Champion of Heartland City.[21] He is also the Original Number's other half that was separated from him, during Astral's battle with Don Thousand long ago.[18]

As Yuma cooperates with Astral and assists him in the gathering of his "Number" cards, Yuma learns the truths that connect him to his destiny through his beloved father, Kazuma Tsukumo, and becomes the most important participant in the Interdimensional War between Astral World and Barian World, bringing an end to the hostilities.