Jack is known as the "Absolute King of the Riding Duel", and was once Yusei's best friend, but they became bitter rivals after Jack stole Yusei's Stardust Dragon and D-Wheel and left for Neo Domino City. Now, as a former resident of Satellite, he must hide his past from the rest of society. He is very arrogant and overconfident, but still has a strong conscience. His signature card is also a Synchro monster, Red Daemon's Dragon. He plays a "Swarm" Deck, focusing on quickly Tuning weaker monsters together to summon his Dragon. Jack is one of the five Signers, the chosen ones of the People of the Stars, and carries the Crimson Dragon's Wings.