Leon von Schroeder

Leon von Schroeder, known in Japan as Leonhart von Schroider is the younger brother of Zigfried von Schroeder. He is a very famous duelist who uses the alias of "Leon Wilson" when he duels. He joins Kaiba's KC Grand Championship tournament to help his brother gain revenge on Kaiba Corporation, though he also aspired to duel Yugi Muto.

He idolises his brother, yet realises that Zigfried's actions are wrong. When Zigfried is disqualified, he recruits Leon to help him with his plot to destroy KaibaCorp, by activating "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 believing that winning at Kaiba's own tournament and humiliating him will be enough.

During the duel with Yami 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 it's own effect against it, while Seto Kaiba works on stopping the virus.

Leon's family never paid very much attention to him when he was a kid. They were always focused on preparing Zigfried to take over the company, they and would punish him for distracting Zigfried from his studies. Leon discovered a fondness for fairy tales and even wrote a letter to Maximillion Pegasus, requesting that he make Fairytale Cards. After building a talent with computers, as well as dueling, he was discovered by Zigfried. Who, rather than being angry or ashamed, was impressed with his brother's talents. Recognizing his abilities, he asked his brother to assist him with running their family business, promising him that he would never be alone again.

Leon is a big fan of Yugi and has admired him since Duelist Kingdom. In a scene removed from the English Version, Leon is seen watching Yugi in various tournaments on TV. Leon has wanted to duel against Yugi since Duelist Kingdom and gains his chance in episode 196.

In the English Version, Leon made a final appearance in episode 220. He had no lines and was just standing at the balcony of his castle, looking up at the sky. Zigfried was not shown. In the Japanese ending, Leon was seen with Zigfried, who was seen trying to make a business deal with Maximillion Pegasus. He is also the final duelist Yugi and Atem face as one.

Deck
Leon uses a Fairy Tales 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.