This unnamed Duelist is the playable character in Free Duel Mode in Yu-Gi-Oh! ZEXAL World Duel Carnival, who can also be unlocked for use in Story Mode. He can also be Dueled in Free Duel Mode, where he has his own Decks. He is based on (and may be) the player character from the Tag Force series.
During his story mode, Dumon determines that he must be Nash, as Nash had always worn the same hat. Yuma Tsukumo recalls a story his father told him about the hat. His father had found the hat on one of this adventures. He told Yuma to never touch it, as it had the power to change the fate of the world.
These Decks are used when he is an opponent in Free Duel Mode.
- Armageddon Knight
- Black Luster Soldier - Envoy of the Beginning
- Black Luster Soldier - Envoy of the Evening Twilight x3
- Blackwing - Zephyros the Elite
- Chaos Sorcerer x2
- Dark Armed Dragon
- Gaia, the Polar Knight
- Gaia, the Mid-Knight Sun
- Gorz the Emissary of Darkness x2
- Guardian of Order x2
- Lyla, Lightsworn Sorceress x2
- Ryko, Lightsworn Hunter x3
- Summoner Monk x2
- Tragoedia x2