Gozaburo Kaiba was the previous president of the Kaiba Corporation. He was an evil man who produced war technology and dealt in underhanded business,
even using his own family to get his way. He was also a champion at chess. Seto beat Gozaburo at chess while in the orphanage with the bet that if Seto beat him
at his own game, Gozaburo would adopt both him and his brother Mokuba. Originally, Gozaburo intended to use Seto to motivate his real son Noah. But after
Noah was mortally injured and his mind digitized, Gozaburo decided to have Seto be heir to his financial empire instead. He made Seto study rigorously
and treated him like a slave.

But Seto and Mokuba didn't know about Noah. A woman by the name of Diane Tsukino did. She was a new made the Gozaburo originally hired to clean up
around his office and keep an eye on his two sons. Diane had a family of her own as well. She'd sometimes bring them with her and put them in a playroom
that Seto and Mokuba used to use while she worked.

Gozaburo became quite fond of Diane and soon he fell in love with her. He told her about what happened to his son and even let her see him sometimes.
Gozaburo had a child with Diane. A little girl named Ruka. But Gozaburo decided to keep her since Diane told him that she couldn't afford to care for
another child without enough money. He asked Diane to marry him, but she refused. She was satisfied with the way her life was already.

But after Seto humiliated him again by taking over his company, he left Ruka in the care of another maid that worked for him while he went AWOL
and digitized his own damn mind in the virtual reality with Noah's like a stupid idiot. This was where he intended to use Noah in his ultimate plan for
being a digital-god by digitizing the entire world, as well as defeat Seto at his own game of Duel Monsters, using the semi-invincible Exodia Necros
as his role monster.

But with a missile heading for Noah's base and defeated by Seto AGAIN, a raging Gozaburo turned himself into a monstrous entity to kill Seto, but he
and Yugi got out just in time. When Diane saw what kind of person Gozaburo really was, she felt that she made a mistake in falling in love with him.
Gozaburo was about to log himself out, but Noah refused to let his father leave, after seeing how cruel he was and how kind Mokuba and the others
were. It was a few moments later that the missile destroyed Noah's base and his virtual domain, thus was the end of Gozaburo, body AND mind.