Dox

Dox, known as Kyū in the Japanese version, is the younger of the two Paradox Brothers. He and his brother Para Duel as a tag team, and appear to Duel the protagonists in both Yu-Gi-Oh! and ''Yu-Gi-Oh! GX''. Dox has the kanji for half of the word "Labyrinth" on his head, with his brother's head having the other half.