Zarc

Zarc or Z-Arc is a character in Yu-Gi-Oh! ARC-V anime series. He is connected to Yūya Sakaki and his dimensional counterparts.

Personality
Zarc used to be a normal Duelist who simply liked to Duel for fun. After the incident when his fans cheering for him after he accidentally injured his opponent, Zarc began to think that injuring his opponent in a Duel is a normal thing to do. Since then, he used more violent Dueling as his fans continue to jeering on him. However, as times went on, he developed violent impulses as he became frustrated that no one matched up to his strength and he wanted to become stronger. His thirst for strength eventually drove him mad, making him obsessed to become the strongest in the world by destroying everyone and everything in his way.

History
Zarc was a resident of the original dimension. He once was a Duelist who claimed able to hear the voices of the monsters and connected his heart with them. Due to this, he was very skilled in Duel and quickly gain advantage on field, soon becoming undefeated Duel champion and widely known as a superstar in Action Dueling. He started to change after his Duel style accidentally severely injured one of his opponents yet the audience kept cheering for him, leading Zarc to think it's fine even if his opponents are injured in the Duel. Since then, his Duel style became more violent. At first, he simply wanted to answer his fans' expectations, however, as he continued to Duel more and more, Zarc became obsessed to become the strongest.

Eventually, in a tournament, he summoned his four dragons, "Odd-Eyes Dragon", "Dark Rebellion Xyz Dragon", "Clear Wing Synchro Dragon", and "Starve Venom Fusion Dragon" to destroy everything in his way. Feeling that his dragons were also not yet satisfied with their battles and seeks to attain the strongest power, Zarc fused himself with his four dragons, becoming a single dragon that people called as the Supreme Dragon King.

Zarc was on the verge to destroy the whole world when Ray opposed him, resulting the world to be splited into four dimensions. Since then, Z-Arc somehow resides within Yūya and his counterparts and constantly tries to consume them so he can be reborn again.