Gozaburo Kaiba

From WikiFic

Seto Kaiba's adoptive father. A national chess champion, orphan Seto challenged Gozaburo to a chess match with the agreement that if he won, Gozaburo would adopt him and his brother. While Gozaburo made good on his deal, Seto did not get the better end. Gozaburo was a harsh father, forcing Seto to study long hours without sleep or food or company. The harsh treatment warped Seto's personality, turning him into a perfectly heartless businessman.

As repayment to his adoptive father, Kaiba took over Kaiba Corperation. As his final lesson, Gozaburo jumped from the boardroom window, teaching Kaiba that the loser must die.