Kyuu

迷宮兄弟・宮

Dox, identified as Kyuu (宮) in the manga and Japanese version, is the younger of the two Paradox Brothers. He and his brother compete as a tag team, appearing to duel the protagonists in both Yu-Gi-Oh! and Yu-Gi-Oh! GX. Dox bears the kanji for half of the word "Labyrinth" on his head, while his brother's head displays the other half.
He and his brother were hired by Maximillion Pegasus to serve as Eliminators in his Duelist Kingdom tournament. The pair duel as a team, using their "Labyrinth Wall" card to transform the playing field into a complex underground labyrinth, making the gameplay more similar to a board game than a card game. The two guard an underground section of the island.