Sakaki Yuuya is the main protagonist of Yu-Gi-Oh! Arc-V. He is a born-entertainer who attends the You Show Duel School to advance his duelling expertise and become an "Entertainment Duellist," a specific type of professional duellist similar to his father.
He has three known dimensional counterparts: Yuuto (from the Xyz Dimension), Yuugo (from the Synchro Dimension), and Yuuri (from the Fusion Dimension). According to Yuzu, he and his counterparts are drawn to each other. He later became one of the Lancers that Reiji Akaba established, in order to defend the invasion from Academia in the Fusion Dimension.
In the manga, Yuuya is an amnesiac mysterious Entertainment Duelist known as "The Phantom" who had hacked into Leo Corporation's Solid Vision with mass system and used it for his own purpose. His goal is to find a card called "Genesis Omega Dragon", a card that is said to be capable of destroying the world for whoever has it. He has three other personalities inside him: the Xyz Duelist Yuuto, the Fusion Duelist Yuuri, and the Synchro Duelist Yuugo.