Leon von Schroeder

Leon von Schroeder, known in Japan as Leonhart von Schroider (レオンハルト・フォン・シュレイダー Reonharuto fon Shureidā) is the younger brother of Zigfried von Schroeder. He is a very famous duelist who uses the alias of "Leon Wilson" (レオン・ウィルソン, Reon Wiruson). He joins Kaiba's KC Grand Championship tournament to help his brother get revenge on Kaiba Corporation, though he also aspired to duel Yugi. He idolizes his brother, yet realizes that Zigfried's actions are wrong. When Zigfried is disqualified and recruits Leon to help him with his plot to destroy KaibaCorp by playing the Golden Castle of Stromberg, which will release a computer virus into the system, Leon initially agrees because he is unaware of his brother's plan. During the Duel with Yugi, he eventually comes to his senses and refuses to help Zigfried, but is unable to remove the card from play. Yugi, however, comes up with a strategy to destroy it by turning its own effect against it, while Kaiba works on stopping the virus.

In the English version, he is voiced by Andrew Rannells, while Seiko Noguchi takes the role in the Japanese version.

Deck
Leon uses a Fairy Tale Deck, composed of cards that were specially created by Maximillion Pegasus upon Leon's request. Tactically, the deck focuses on restricting the opponent's ability to counterattack by removing their monsters from play temporarily or lowering their attack power.