Crawford, Pegasus J.

The eccentric American Chairman of Industrial Illusions (shortened to I²) and the creator of the game Duel Monsters (originally Magic & Wizards. He is the wielder of the Millennium Eye. Pegasus quickly establishes himself as the manga's fourth main antagonist (and the second anime adaptation's first main antagonist), challenging Yugi to a Shadow Game in order to force him to come to his tournament Duelist Kingdom and face him, taking the soul of his grandfather Sugoroku Mutou as a Penalty Game for losing the timed match to ensure this. Throughout the battles to get to Pegasus's castle, Yugi is seen talking to his grandfather through the use of a camcorder. In the second anime, he traps Sugoroku in a Soul Prison Duel Monsters card. Pegasus also kidnaps Mokuba to convince his brother Seto Kaiba to come as well, later capturing their souls, too.

Through a series of flashbacks, Pegasus is revealed to have had a lover, Cyndia, who died after her 17th birthday (she dies after their marriage in the anime). Although the exact details vary from medium to medium, his actions were all carried out in the hopes of resurrecting her. He is eventually defeated in a final game of Duel Monsters by Yugi and Dark Yugi at the end of the arc, and is obliged to release his victims' souls. He is murdered soon after by Dark Bakura and his millennium item is taken. In the Duel Monsters anime, he isn't killed by Dark Bakura's attack and makes brief appearances in later seasons. In the original manga, it's his story about meeting Shadi and the supposed "evil intelligence" of the Millennium Items that prompts Yami Yugi's search for the answer of who he is and where he came from. During his final Shadow Game with Yugi/Dark Yugi, he tells them of his discovery of an ancient Egyptian Shadow Game during his travels in the Valley of the Kings, which inspired his creation of Duel Monsters and the creation of card games in general, such as tarot cards.

In the second anime, as the creator of the card game Duel Monsters and the discoverer of their ancient Egyptian roots, Pegasus often plays a key role due to his extensive knowledge of the game and its mysterious origins. Pegasus J. Crawford is his name in Japanese versions, while Maximillion Pegasus is his name in the VIZ Media-translated manga.

(Source: Wikipedia, Yugipedia)