Seto Kaiba (manga)

Prior to debut
At a young age, Seto and his younger brother Mokuba were orphaned. Their mother died when Mokuba was born, and their father supposedly died in an accident when Seto was eight. Their relatives greedily used up their inheritance and afterward left them at the city orphanage.

The former head of KaibaCorp, Gozaburo Kaiba, arrived at the orphanage to perform a publicity stunt. Seto, who was 10 at the time, saw the chance to challenge him to a game of chess, with the stakes being that Gozaburo was to adopt Seto and Mokuba together, should Seto win. Seto won the game by cheating. Gozaburo then adopted both brothers.

Gozaburo forced Seto into a rigorously accelerated school program, forcing him to study several subjects, including economics, social studies, foreign languages, and game strategy.

Six years later, Seto Kaiba took over his step-father's company by gaining the 51% that he needed to be in control. Gozaburo, provoked by Seto taking over and becoming CEO, committed suicide by jumping out of his office window.

The Cards With Teeth
Kaiba visited the Kame Game shop, not expecting to see anything of value to him, but spotted Sugoroku Mutou "Blue-Eyes White Dragon" on the counter. Sugoroku refused to trade or sell the card because of its sentimental value to him. Kaiba stormed off in a huff, believing Sugoroku to be a fool.

The next day at school, Sugoroku's grandson, Yugi had brought the "Blue-Eyes White Dragon" card in with him. Kaiba pretended to have learnt a lesson about loving cards from Sugoroku and asked Yugi if he could see the card. Yugi showed him the card, but Kaiba exchanged it for a counterfeit, thinking Yugi hadn't noticed. However when he was leaving school, Yugi approached him, saying he knew he took the card, but didn't want to say it in front of everyone else earlier. Kaiba denied it and whacked Yugi with his briefcase when Yugi persisted to ask for it back.

Dark Yugi then emerged and challenged Kaiba to a Shadow Game of Duel Monsters. As Kaiba was about to lose, he snuck the stolen "Blue-Eyes White Dragon" into his hand and played it. However the "Blue-Eyes" remained loyal to Sugoroku and betrayed Kaiba, by destroying itself. After Kaiba lost, Dark Yugi inflicted a Penalty Game, where Kaiba imagined he was sent to the Duel Monsters Spirit World and repeatedly killed by Duel Monsters, though it was just a sensation of death.

Hologram simulator projects
Kaiba began work on creating holographic technology to heighten the experience of playing Duel Monsters. He designed the Battle Boxes, which were arenas that players sat inside while playing Duel Monsters and would be surrounded by projections of the monsters they Summon.

He passed the idea on the creator of Duel Monsters, Maximillion Pegasus. Pegasus invited Kaiba as his special guest to witness his televised Duel against the Card Professor, Keith Howard. At the Duel, Pegasus simply sat in front of Keith for a few seconds, then wrote down some instructions on a piece of paper, which he gave to a beginner from the audience to use against Keith. While Tom dueled Keith, Pegasus sat with Kaiba and accepted his proposal.

Kaiba was later invited to the Duelist Kingdom island to celebrate the launch of the Battle Boxes.

Kaiba infered that Pegasus must have read Keith's mind in the Duel, so later he began making Duel Disks to combat Pegasus' mind reading strategy. With Duel Disks, players would be able to stand further apart and avoid face-to-face contact, which he hoped would be enough to avoid having his mind read.

Death-T
The four "Blue-Eyes White Dragon" cards were possessed by an American, a German, a Hong Konger, and Sugoroku Mutou of Japan, Yugi's grandfather. Kaiba took the cards belonging to the former three using force: by either forcing the person into bankruptcy, by making deals with the mafia, or by forcing the person to commit suicide.

Even though he's returned to normal, Kaiba still continues to suffer nightmares of his Illusion of Death. Kaiba works on constructing a KaibaLand theme park in Domino City and spends 10 billion yen on the Death-T park, which is set on constructing artificial Penalty Games to get his revenge on Yugi. He hires people such as professional hit men and a serial killer to work in stages of Death-T. Mokuba also offered to face Yugi in one of the stages. Kaiba tried talking him out of it, believing Mokuba to be no match for Yugi, but Mokuba insisted and took the role anyway in the hopes of winning Seto's respect. Kaiba even made a bet on which stage of Death-T, Yugi would die on, choosing the final stage, meaning he bet Mokuba would lose.

He invites Yugi and his friend Katsuya Jonouchi to his mansion the night before the grand opening of the KaibaLand and has Sugoroku Mutou kidnapped unbeknownst to them.

The next day, he brought Yugi and Jonouchi to the opening as his special guests. Here he is confronted by a former KaibaCorp employee, who accuses Kaiba of driving his father to commit suicide, but the man is quickly removed. Kaiba grants Yugi and Jonouchi free access to a number of rides, before he takes them to a special show. Here he reveales that he has kidnapped Sugoroku and faces him in a game of Duel Monsters in his new Battle Box simulators. Sugoroku uses "Blue-Eyes White Dragon", but loses as he is overwhelmed by the holograms and Kaiba's 3 "Blue-Eyes White Dragons". After winning Kaiba tears-up Sugoroku's "Blue-Eyes White Dragon" card, so it cannot be used against him and has Sugoroku subjected to an artificial Penatly Game, where he's attacked by holographic monsters. Kaiba makes Yugi swear to participate in Death-T, in exchange for releasing his grandfather.

Yugi accepts, but Jonouchi won't let him do it alone. Their friend Hiroto Honda, who was in the audience with his nephew Johji also accompanies them.

In the first stage, Death-T 1, Kaiba has Yugi and his friends face the hitmen in a shootout game. Although the game is greatly rigged against Yugi, his friend Anzu Mazaki had been hired by KaibaCorp for that stage. Yugi and his friends still managed to defeat the hitmen.

In Death-T 2, he subjects them to an electric chair ride and guillotine, where they must solve a riddle to prevent their hands being cut off. For the final part of the stage he kidnaps Johji, who is a fan of his and such cooperates. Kaiba forces a member of the party to face the Chopman in a fight to the death, to get Johji back. He appears on a screen on the Chopman's stomach telling the group of the Chopman's crimes.

In Death-T 3, he has the group enter a room, where blocks fall from the ceiling. The friends manage to make it out, apart from Honda, who gets stuck behind.

Death-T 4 was Mokuba's stage. Beforehand, Mokuba approachs Seto about him betting against his own brother. Seto reminds Mokuba that he tried talking him out of it, as he can't beat Yugi and calls him a loser. Mokuba stormed off eager to show Seto up. The stage consisted of a rigged game of Capsule Monster Chess. Mokuba was defeated by Dark Yugi, so Kaiba subjected him to an artificial Penalty Game, similiar to Sugoroku's. However Dark Yugi, saves Mokuba. Mokuba reconsiders recent events and notices Seto has changed and wonders if Yugi can return him to normal.

Kaiba faces Dark Yugi in a game of Duel Monsters in the final stage. Yugi uses his grandfather's Deck. As the game nears the end, Kaiba has Summoned his 3 "Blue-Eyes White Dragons", almost ensuring victory, but Yugi manages to Summon "Exodia" and defeat Kaiba. Dark Yugi then inflicts another Penalty Game on Kaiba. This time he gves him a "Mind Crush", which dispels Kaiba's evil side and leaves Kaiba in a coma, where he must reassemble the "shattered puzzle of his heart".

Duelist Kingdom
Kaiba remained in a coma for the next few months. In the hopes of helping Kaiba finish the puzzle, Mokuba constructed two lockets, using a torn photo of them from the orphanage and put it around Seto's neck, believing it to be the final piece of the puzzle.

As he remains in his coma, Maximillion Pegasus takes the opportunity to try and take over KaibaCorp. He teams up with The Big Five and has Mokuba kidnapped.

At the Duelist Kingdom tournament. Yugi duels the Ventriloquist of the Dead, who is using Kaiba's stolen Deck. Kaiba manages to solve the puzzle and wake-up, during this Duel. His willpower is channelled into one of the stolen "Blue-Eyes White Dragon" cards, causing it to destroy itself.

Kaiba makes his way to Duelist Kingdom to save Mokuba. The two men on the helicopter turn out to be Pegasus' spies. One of them holds a gun to Kaiba, but Kaiba jams it using a "Gyakutenno Megami" card. He grabs the gun, snapping the man's finger in the process. Kaiba then forces him and the pilot to jump into the ocean. He flies the helicopter to the island himself.

On the island, Kaiba meets-up with Yugi's group and has his Deck returned to him. Jonouchi challenges Kaiba to a Duel and Kaiba easily defeats him, using his new Duel Disk technology. He goes against Yugi's suggestion of teaming-up and heads to the castle to face Pegasus.

At 2:30 am, he arrives at the castle. Croquet denies kidnapping Mokuba and refuses to let Kaiba see Pegasus until the morning, but Kaiba seizes Croquet by the collar, demanding to see Pegasus. Croquet then shows Kaiba to a gateway, sealed with a lock containing str-shaped holes. To see Pegasus, he must pass through this gate, Croquet tells him and in order to do that, Kaiba must get 10 Star Chips. Kaiba eventually loses patience with Croquet and strikes him with his briefcase. Saruwatari rushes in and pulls out a gun, but Kaiba quickly puts his own gun to Croquet's head. Croquet panics and orders Saruwatari to stand down.

Kaiba takes Croquet hostage in the questroom, threatening to snap his neck in a briefcase if Pegasus doesn't speak to him. Shortly afterwards, Pegasus appears on a screen and permits Kaiba to see him, if he can beat Yugi in a Duel. Saruwatari gives Kaiba 5 Star Chips, Mokuba had stolen earlier and Pegasus instructs Kaiba to wager them in a Duel against Yugi.

Kaiba confronts Yugi outside the castle and imposes a Duel. Yugi's friends try to advise him against accepting, as he already has enough Star Chips, but he switchs to Dark Yugi and accepts. Kaiba uses the Duel as an oppurtunity to test his strategy to combat Pegasus' mind reading abilities. Since he was using Duel Disks, he was able to stand further apart from his opponent and avoid face-to-face contact. Kaiba Summons "Blue-Eyes Ultimate Dragon", causing problems for Yugi, but Yugi fuses it with "Mammoth Graveyard", causing it to decay and lose ATK each turn. In the meantime, Kaiba is unable to draw new cards, as the Fusion is taking up 4 slot in his Duel Disk. As Yugi is about to win, Kaiba stands up on the edge of the castle, such that if Yugi makes another attack, he will fall to his death. Although Dark Yugi tries to attack, Yugi takes over and calls it off. Kaiba wins on the next turn, taking 5 of Yugi's Star Chips.

With 10 Star Chips, Kaiba enters the castle and confronts Pegasus. He insists on using the Duel Disks, but Pegasus isn't too keen. Pegasus accepts under the condition, that Mokuba who is stripped of his soul, holds the Duel Disk for him. Kaiba refuses to face his brother in such a way and agrees to duel without the Disks. Pegasus defeats Kaiba and traps his soul in a "Soul Prison" card, as a Penalty Game.

When Yugi defeats Pegasus, as promised Pegasus frees the souls of Seto and Mokuba Kaiba, along with Sugoroku Mutou. Yugi tells Seto that Mokuba was the last piece. The child Seto, who was shown beginning to put the puzzle together at the end of Death-T, is shown once again, holding the finished puzzle.