The Light Brigade

T-Bone known in Japan as Iwamaru (岩丸) is an assassin who escaped Sarina's lair with Blaze. Although he befriended Jaden, his master tracked him down and coerced him into dueling the boy. Following his defeat, he was sealed in a mirror by Sarina, but was freed alongside the other Light Brigade duelists after Jaden and Aster defeated her. In the English version, he is a rapper wannabe. The "Iwa" portion of his name in the Japanese version is derived from the word "iwa" (岩), meaning "rock."

Card list
T-Bone plays a Rock deck, but the signature cards of his fellow Light Brigade duelists were forcefully placed in his deck by Sarina for his duel with Jaden. His main strategy consists of the repetitive summoning of copies of his Rock-type monsters through Guidance to Ore. The Monarchs themselves fuel the summoning of T-Bone's greatest monster, Demiurge Ema, which has the ability to draw strength from Spells and Traps that have become Homunculus Tokens.