Zarc is a character and the main antagonist appearing in the Yu-Gi-Oh! ARC-V anime. He is the original incarnation of Yuya Sakaki (Standard Dimension), Yuto (Xyz Dimension), Yugo (Synchro Dimension), and Yuri (Fusion Dimension).
Originally a pro Duelist with genuine good intentions, Zarc went insane due to the aggression of his dragons and his own obsession of becoming the strongest Duelist, which in turn caused him to destroy the Original Dimension and take on a dragon form known as Supreme King Z-ARC. During a confrontation with Ray Akaba, Zarc's soul was split into four and reincarnated into four different lives. He is the original owner of the Four Dimension Dragons and, along with Ray, one of the true co-creators of Pendulum Summoning.