Vector is a character in the Yu-Gi-Oh! ZEXAL anime. An Emperor from Barian World, he manipulated Dr. Faker and Byron to fulfill his own ambition of destroying Astral World. After his first defeat at the hands of Yuma Tsukumo, Ryoga Kamishiro and Kaito Tenjo, he orchestrated a new scheme by taking on a human form on Earth and calling himself Rei Shingetsu, as part of a gambit to orchestrate the downfall of the ZEXAL wielders. When that failed, Vector released the god of the Barian World, Don Thousand, and became his host. They collaborated efficiently, but Thousand eventually betrayed Vector by absorbing him to restore his power. A reformed Vector was revived by Astral after Yuma defeated him in their ceremonial Duel.
His actions establish him as one of the central antagonists of the series, having been the prime instigator of most of the events in the it through his manipulations of Dr. Faker and Byron along with cooperating with Astral's nemesis, Don Thousand, and his treachery against his former colleagues.