Joey Wheeler, known as Katsuya Jonouchi in the Japanese version, is a central character in the Yu-Gi-Oh! series. He is one of Yugi Mutou's best friends and a talented Duelist in his own right. Despite his brash and impulsive nature, Joey is fiercely loyal and often provides comic relief. Throughout the series, he matures from a street-smart brawler into a skilled and strategic card player, constantly proving himself in high-stakes duels. His character development highlights themes of friendship, perseverance, and growth.