Mokuba Kaiba (manga)

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Mokuba Kaiba
Mokuba Kaiba
  • Mokuba Kaiba
RōmajiKaiba Mokuba
BirthJuly 7[1]
  • 1.42 m <br />4.659 ft <br />55.906 in <br />142 cm[1]
  • 61.729 lb <br />28 kg[1]
  • Male
Blood type
Favorite foodChocolate parfait[1]
Least favorite foodCelery[1]
  • Career
Manga debutYu-Gi-Oh! Duel 02424: "Capsule Monster Chess"
Kaiba, Mokuba

Mokuba Kaiba is a character in the Yu-Gi-Oh! manga. This is the original depiction of Mokuba Kaiba, as created by Kazuki Takahashi.

Mokuba is the younger brother of Seto Kaiba. He is initially perceived as a spoiled brat, with vindictive and malevolent behavior. He was a champion at Capsule Monster Chess, but cheated in many of the games he played. His negative traits are partly credit to the neglect he gets from his older brother, whom he desires to prove his worth to. His behavior improves as he befriends Yugi Mutou and his companions and as Seto grows to love and appreciate him.



At a young age, Mokuba and Seto were orphaned. Their mother died when Mokuba was born. Their father died in an accident when Mokuba was three. Their relatives used up their inheritance and left them at the city orphanage. Due to the trauma of their losses, Seto came to tell Mokuba never to trust anyone.

When the former head of Kaiba Corporation, Gozaburo Kaiba, arrived at the orphanage to adopt an heir, Seto saw the chance to challenge him to a game of chess, with Gozaburo forced to adopt Seto and Mokuba should he win. Mokuba was five at the time. Seto had won by cheating.

As Seto usurped Gozaburo for the presidency of KaibaCorp, the young gamer descended into evil, and grew to neglect Mokuba more and more, leading to Mokuba to go to many lengths to earn his brother's affections.


Mokuba, with his followers

Mokuba led a gang of followers his age. With them, he planned to beat Yugi in a game to get revenge for him beating his brother in Duel Monsters and inflicting a Penalty Game on him. Mokuba got Old Man Dentures to rig his Capsule Monster Chess coin machine. He and his gang later arrived at Dentures' store to meet Yugi at the coin machine. After introducing himself as Seto Kaiba's brother, to Yugi, he has his followers seize Yugi and forced him into a game. They proceed to take Dentures coin machine. Dentures acted mad at first, but allowed them to carry on after Mokuba dropped a large amount of money in front of him.[2]

Mokuba's "Capsule Hell" Penalty Game

The gang took Yugi and the dispenser to their hideout, where they forced him to play Capsule Monster Chess against Mokuba. As Mokuba hoped, Yugi changed to Dark Yugi for the game. The rigged dispenser gave Yugi mostly low Level monsters and Mokuba mostly high Level ones. They accepted the stakes that if Mokuba won, he got to cut off one of Yugi's fingers and if Yugi won, Mokuba would have to play a Penalty Game. Dark Yugi made the game a Shadow Game. Throughout it, he sacrificed his monsters to draw Mokuba's into a diagonal line and used his last monster "Torigun" to take Mokuba's remaining four monsters all out at once. For Mokuba's Penalty Game, he believed that he was trapped inside a giant Capsule Monster Chess capsule. Before the capsule had Mokuba fully engulfed, he warned Yugi that Death-T was coming.[2]

During the planning of the theme park Death-T, Mokuba insisted on facing Yugi in one of the stages. Although Seto advised against it, they still went through with it. The two of them also made a bet over which stage Yugi would die in. Mokuba bet Death T-4, while Seto bet Death T-5.[3]

When Kaiba's chauffeur brought Yugi and Jonouchi to their mansion, Mokuba met them in the car. He introduced himself as the vice-president of KaibaCorp and told Yugi his given name for the first time. He told Yugi not to worry as they would be giving him V.I.P. treatment for the grand opening of Kaiba's new secret project, but still maintained a suspicious air about himself. At the mansion, Mokuba invited Yugi and Jonouchi to a meal, featuring the best food in the world. However the meal turned out to be six servings of a meal a spoiled young child would like. He suggested that they take turns spinning the turntable that the food is on and eat the meal that lands in front of them. He lied that there wasn't poison in them and claimed that there was a treasure hidden in one. Jonouchi went first and Mokuba used a hidden switch in a syrup bottle to give him a poisoned meal. He admitted to lying and introduced the meal as a game of Russian Roulette Dinner. He forced Yugi to continue to win the antidote to save Jonouchi. Yugi switched to Dark Yugi, who figured out how Mokuba was cheating and managed to smash the syrup bottle, giving Mokuba a poisoned meal. Mokuba ate it and lost, handing the antidote over to Yugi. Mokuba fell over poisoned, while the butler rushed to his aid.[4]

The next day, Mokuba prepared to face Yugi in another game of Capsule Monster Chess, during Death T-4. He confronted Seto about their bet on which stage Yugi would die on. He pointed out that Seto bet Yugi would die in Death T-5, meaning he bet Yugi would beat Mokuba. Seto stood by his choice, said that Mokuba cannot beat Yugi and reminded Mokuba of how he tried and failed to show him up by beating Yugi in a game before. Mokuba hung his head and said that he thought Seto would like him, if he beat Yugi. Seto yelled at Mokuba that there is no room for brotherly love in the world of gaming and until Mokuba realizes that, he would always be a loser. Mokuba stormed off to face Yugi, eager to prove Seto wrong.[3]

Mokuba subjected to the "Experience of Death" Penalty Game.

Mokuba rigged the Capsule Monster dispenser again,[5] but still lost. Seto, held no sympathy for his brother and subjected him to the "Experience of Death" Penalty Game, as per Death-T rules. However Dark Yugi returned and saved Mokuba from the grisly punishment. Mokuba was surprised that Yugi saved him and asked why. Yugi replied that he wouldn't have won, if he didn't have his friends supporting him. This caused Mokuba to reflect on his past and how Seto had changed since they left the orphanage. He wondered if Yugi could help Seto when he faced him in the next round.[6]

To thank Yugi for saving him, Mokuba rescued Yugi's friend Honda, who had been trapped in the previous stage of Death-T. After Seto's defeat and subsequent "Mind Crush" Penalty Game, Mokuba explained the Kaiba brothers' history to Yugi and his friends. Dark Yugi told Mokuba that Kaiba would wake up again after he had reassembled the shattered puzzle of his heart and Mokuba vowed to wait as long as it took for his brother to return.

Duelist Kingdom[edit]

Mokuba Duels Dark Yugi, while in disguise.

While Kaiba was in a coma after Death-T, Maximillion J. Pegasus and The Big Five tried to take over KaibaCorp. The Big Five came to Kaiba Manor one night to steal documents from a safe, but Mokuba swallowed its key in front of them. As a result Mokuba was kidnapped and brought to the Duelist Kingdom island, where he was kept under watch, particularly when he used the bathroom. Mokuba overheard that as part of Pegasus deal with The Big Five, Pegasus would have to beat Yugi in an official game of Duel Monsters to rebuild KaibaCorp's reputation. Yugi was also on the island for the Duelist Kingdom tournament, in which Pegasus hoped to defeat Yugi in the finals. Mokuba escaped his captivity to make an attempt to eliminate Yugi from the tournament in order to prevent him and Pegasus having an official Duel.[7]

Mokuba disguised himself with a hat and bandanna. He challenged one of the tournament's participants to a Duel, but stole his Deck and Star Chips before the Duel began. Mokuba later encountered Dark Yugi, who had heard of the theft and was searching for the thief. He challenged Dark Yugi to a Duel, where they both wagered all their Star Chips, and Dark Yugi accepted despite knowing his opponent was the thief. Mokuba proved to be no match for Dark Yugi, so he tried to grab all the Star Chips and run. However Dark Yugi grabbed him by the wrist and removed his disguise.[8] At first, Mokuba refused to return to Star Chips he had managed to grab and told Dark Yugi and his friends about Pegasus' plan to take over KaibaCorp. Dark Yugi promised that he would defeat Pegasus and Anzu convinced Mokuba to trust Dark Yugi. However Saruwatari stopped him returning the Star Chips, citing that it was against the rules to exchange Star Chips without Dueling.[7]

Mokuba's soulless body.

Saruwatari grabbed Mokuba, confiscated his Star Chips and was about to take him back to captivity. Two of those Star Chips belonged to Dark Yugi, but Saruwatari refused to exchange Star Chips outside a Duel, so he arranged for Dark Yugi to face the Ventriloquist of the Dead. The ventriloquist claimed Seto Kaiba was dead and his soul resided in a puppet, in order to get revenge on Yugi. Mokuba was largely offended by the fraudulence. During the Duel, Saruwatari revealed his own identity to Mokuba, who remembered him as his bodyguard at KaibaCorp.[7] Before the Duel was finished, he snuck away taking Mokuba with him.[9]

To stop Mokuba escaping again, Pegasus sealed his soul in a "Soul Prison" card. His body was left with just enough volition to obey Pegasus' orders.[10]

When Kaiba woke from his coma, he traveled to Duelist Kingdom to save Mokuba.[9] During his Duel with Dark Yugi, he imagined Mokuba getting sucked into his decaying "Blue-Eyes Ultimate Dragon". A vision of Kaiba's younger-self glared at him for losing Mokuba. This prompted Kaiba to put his life on the line, so that he could save Mokuba.[11]

Kaiba challenged Pegasus to a Duel, for Mokuba's freedom, using Duel Disks. Pegasus knew better than to fight on his enemy's terms, so he showed Kaiba Mokuba's soulless body and said that he would only Duel with the Duel Disks if Mokuba would be his proxy and throw the disk for him. Kaiba refused to fight Mokuba, so he agreed to fight without the Duel Disks.[10] Kaiba lost the Duel and also had his soul sealed in a "Soul Prison".[12]

Kaiba and Mokuba, reunited.

Feeling he owed Mokuba for saving him in Death-T, Honda asked Dark Yugi to try and free the souls of Kaiba brothers, while he took care of finding their soulless bodies.[13] On the eve of the tournament finals, Honda searched Pegasus Castle and found Mokuba's body and managed to retrieve it with help from Ryo Bakura and Dark Bakura.[14][15]

When Dark Yugi defeated Pegasus, Pegasus freed the souls of the Kaiba brothers and Sugoroku Mutou.[16] Mokuba woke up in the bed that Honda had left him in. Kaiba woke up in Pegasus dungeon and an apparition of his younger self appeared and led him outside to Mokuba. On their reunion, the apparition of Kaiba held the "Puzzle of Kaiba's heart", which was now complete, before he vanished. Dark Yugi commented that Mokuba was the final piece of the puzzle. Before leaving the island on Kaiba's helicopter, Mokuba mocked Yugi and his friends for not having a helicopter of their own. However, when he saw that they had no way of getting home, he talked Kaiba into giving them a ride.[17]

Battle City[edit]

Mokuba as steering committee chairman at Battle City.

Mokuba stood alongside Kaiba at the announcement of the Battle City and helped him put on his Duel Disk as Kaiba explained some of the rules.[18] During the tournament he worked as "steering committee chairman" and had the job of settling disputes.[19]

Mokuba stepped in to adjudicate when he spotted Koji Nagumo trying to force a player he defeated to give him a second rare card or ¥100,000 through the ante rule. Mokuba explained that changing the ante after a Duel and betting money were both against the rules. He also ruled that the defeated player's wagered was a fair ante against Koji's "Hyozanryu". Koji was unwilling to cooperate. However Kaiba showed up and took over. Mokuba showed him Koji's "Hyozanryu", which Kaiba proceeded to rip up before challenging Koji to a Duel. To compensate, Kaiba wagered "The God of the Obelisk" and a briefcase of rare cards, the latter of which he allowed Koji to borrow during the Duel. Kaiba easily won and he and Mokuba left together.[19]

When Kaiba was notified of Yugi dueling a Rare Hunter with an Egyptian God card,[20] Kaiba and Mokuba both headed towards the Duel.[21] Mokuba told Dark Yugi not to lose to the Doll, as he wanted Dark Yugi to Duel Kaiba later in the tournament. Mokuba was shocked by the high ATK values "Slifer the Sky Dragon" was achieving and asked Kaiba how Dark Yugi could defeat a monster with infinite ATK. Kaiba realized that Mokuba was wrong and warned Dark Yugi, telling him nothing was infinite;[22] a clue which led to Dark Yugi winning the Duel.[23] The Doll knelt motionless after the Duel, so Mokuba saw it as his duty to judge the ante. He handed Dark Yugi "Slifer the Sky Dragon" and the Doll's Puzzle Card, but told him not to get used to them, as they would soon belong to Kaiba.[24]

Mokuba collects Kaiba and Dark Yugi in the helicopter.

Mokuba was shocked to see Kaiba immediately challenge Dark Yugi to a Duel, following the defeat of the Doll. However Marik Ishtar took control of the Doll again to say that he had put Dark Yugi's friends in danger. Dark Yugi left to find his friends and was soon followed by Kaiba, leaving Mokuba alone.[24] Mokuba returned to a control center and following Kaiba's orders, used GPS to track Jonouchi's location.[25] He then boarded a helicopter, which collected Kaiba and Dark Yugi after their Duel with the Masks of Light and Darkness.[26] Mokuba asked Kaiba he was bothering searching for "that loser" Jonouchi. Kaiba explained that he was interested in seeing how Dark Yugi could possibly make use of the "power of unity" when forced to fight his friend, due to Marik's alleged brainwashing powers.[27]

They tracked Jonouchi's location to Domino Pier. Mokuba saw Yugi's friends being possessed by the power of Marik's Millennium Rod and was disgusted by Marik forcing Jonouchi and Dark Yugi into a Duel, in which one of them would drown. He urged Kaiba to help them. However Mokuba was taken hostage by a Rare Hunter, who threatened to kill him if Kaiba interfered.[28] Near the end of the Duel, Kaiba disarmed that Rare Hunter by throwing a card, which lodged into his hand. He then fought off the two Rare Hunters, saving Mokuba.[29] After the Duel, Mokuba pulled Yugi out of the water and told him that Kaiba had saved Jonouchi.[30]

Mokuba and Kaiba took the helicopter to Domino Stadium, to get to the location of the finals.[31] After the Battle Ship arrived, Isono was going to refuse to let Anzu, Honda, Shizuka and Otogi board as they were not finalists. However Mokuba insisted that he let them on.[32]

During Mai Kujaku and Dark Marik's quarterfinal Duel, Kaiba got Mokuba to use the orbital camera on their satellite to zoom in on Mai's Duel Disk, so that they could get an image of the text on "The Sun Dragon Ra".[33]

Transcend Game[edit]

Mokuba observed the Duel Links beta testers and was pleased to have Duelists from all over the country gathered to see the world that his brother had created and offer their help, free of charge.[34]

When unfamiliar data began registering on the main branch laboratory's Duel Links surveillance monitor, Mokuba notified Kaiba of the irregularity. He showed him a globe, with Neurons signals mapped onto it. The signals from the test subjects were all being drawn towards an unknown consciousness and forming a spike above Japan. Kaiba recognized this as the dimensional ascension he had been looking for and against Mokuba's concern, logged into the Duel Links' virtual reality. As Kaiba approached Atem in the Duel Links world, his brainwaves ascended beyond human capabilities, putting his life in danger. So Mokuba pulled an emergency switch, shutting down Duel Links and stopping Kaiba going any further.[35]

The Dark Side of Dimensions[edit]

Mokuba, during the Millennium Puzzle excavation

Mokuba took part in KaibaCorp's Millennium Puzzle excavation at the Mortuary Temple and contacted Kaiba after they had found the disassembled puzzle. When Kaiba arrived, Mokuba voiced concern over how they planned on reconstructing the puzzle when that feat had previously taken Yugi Mutou eight years, but Kaiba assured him he could do it, as Yugi had only been a child at the time. The removal of the puzzle was interrupted by Diva, who used his Quantum Cube to materialize a security personal. Despite a number of workers fleeing, Mokuba remained put and watched as Kaiba and Diva Dueled. When the security timer lock on the Millennium Puzzle's encasing expired, allowing it to be moved, Mokuba hooked the case onto a helicopter. The helicopter flew away, while Mokuba held onto the hook and stood on the case. Diva abandoned his Duel and teleported up to Mokuba. Diva was able to put his hand through solid matter and tried to grab the puzzle pieces from the case, but Mokuba saw what he was doing and headbutted him, causing him to fall back to the ground. Unbeknownst to Mokuba, Diva managed to take two pieces of the puzzle.[36]

Diva was abducted by KaibaCorp some time after they realized the pieces were missing. While interrogated by Mokuba, Diva acted confident that they would not recover both pieces of the puzzle. However Mokuba was aware that Diva had given the second piece to his sister, Sera, and taunted him by showing pictures of her.[36]

Mokuba was present at the exhibition, where the Duel Disk v3 was showcased with Duels between Yugi, Diva and Kaiba over the ownership of the two pieces of the puzzle.[36]

After the defeat of Dark Diva, Kaiba made another attempt to communicate with Atem in the afterlife. Mokuba tried to talk him out of it, arguing that the system had not been properly tested and was too dangerous. Kaiba remained adamant that he continue and said that Mokuba was in charge while he was gone.[36]

Gaming items[edit]


Mokuba was not shown with a Duel Monsters Deck of his own. However during Duelist Kingdom, he used a Deck, which he stole from a participant. The only cards shown in this Deck were "Crocodilus" and "Man-Eating Plant".

Capsule Monster Chess pieces[edit]

The first time Mokuba faced Yugi, he used the following Capsule Monster Chess pieces:

Head Sucker Gumbo Cobrada Dinosaur Wing The Skull
Head Sucker Gumbo Cobrada Dinosaur Wing The Skull

When he faced Yugi in Death-T, he used the following:

Megaton Nama Hargen Big Foot Zoid "M" Armorsaurus
Megaton Nama Hargen Big Foot Zoid "M" Armorsaurus


Mokuba played the following games.

Opponent Game Outcome Chapter(s)
Dark Yugi Capsule Monster Chess (game) Lose DM02424
Dark Yugi and Katsuya Jonouchi Russian Roulette Dinner Lose DM02626
Dark Yugi Capsule Monster Chess (game) Lose DM03434, DM03535
Dark Yugi Duel Monsters (game) N/a[n 1] DM07373 (D 14)
  1. The Duel was canceled after Mokuba tried to grab the Star Chips and run away.


  1. a b c d e f Yu-Gi-Oh! Character Guidebook: The Gospel of Truth: Mokuba Kaiba's profile
  2. a b Yu-Gi-Oh! Duel 02424: "Capsule Monster Chess"
  3. a b Yu-Gi-Oh! Duel 03434: "Arena #2"
  4. Yu-Gi-Oh! Duel 02626: "Russian Roulette"
  5. Yu-Gi-Oh! Duel 03535: "Board Game Deathmatch"
  6. Yu-Gi-Oh! Duel 03636: "Battle Beyond Hope"
  7. a b c Yu-Gi-Oh! Duel 07474 (Duelist Duel 15): "Messenger From Hell"
  8. Yu-Gi-Oh! Duel 07373 (Duelist Duel 14): "The Thief"
  9. a b Yu-Gi-Oh! Duel 07676 (Duelist Duel 17): "The Legendary Dragon"
  10. a b Yu-Gi-Oh! Duel 108108 (Duelist Duel 49): "The First Stages of Fear!"
  11. Yu-Gi-Oh! Duel 105105 (Duelist Duel 46): "No Mercy"
  12. Yu-Gi-Oh! Duel 111111 (Duelist Duel 52): "The Promise"
  13. Yu-Gi-Oh! Duel 112112 (Duelist Duel 53): "The Eve of Battle"
  14. Yu-Gi-Oh! Duel 113113 (Duelist Duel 54): "Stealth in the Night!"
  15. Yu-Gi-Oh! Duel 119119 (Duelist Duel 60): "Because We're Friends"
  16. Yu-Gi-Oh! Duel 132132 (Duelist Duel 73): "The Tragic Tale of the Millennium Eye"
  17. Yu-Gi-Oh! Duel 133133 (Duelist Duel 74): "The Precious Piece"
  18. Yu-Gi-Oh! Duel 150150 (Duelist Duel 91): "The Gathering"
  19. a b Yu-Gi-Oh! Duel 159159 (Duelist Duel 100): "Behold the God!"
  20. Yu-Gi-Oh! Duel 173173 (Duelist Duel 114): "Combo of Despair!!"
  21. Yu-Gi-Oh! Duel 174174 (Duelist Duel 115): "The Combo of God!!"
  22. Yu-Gi-Oh! Duel 175175 (Duelist Duel 116): "A Duelist's Power"
  23. Yu-Gi-Oh! Duel 176176 (Duelist Duel 117): "God Falls!?"
  24. a b Yu-Gi-Oh! Duel 177177 (Duelist Duel 118): "Targets!"
  25. Yu-Gi-Oh! Duel 184184 (Duelist Duel 125): "Arena of Death!!"
  26. Yu-Gi-Oh! Duel 190190 (Duelist Duel 131): "Where Jonouchi Waits"
  27. Yu-Gi-Oh! Duel 191191 (Duelist Duel 132): "The Place of Destiny"
  28. Yu-Gi-Oh! Duel 192192 (Duelist Duel 133): "The Unwanted Duel!!"
  29. Yu-Gi-Oh! Duel 197197 (Duelist Duel 138): "One Card of Life and Death!"
  30. Yu-Gi-Oh! Duel 199199 (Duelist Duel 140): "The Treasure"
  31. Yu-Gi-Oh! Duel 201201 (Duelist Duel 142): "Warriors Assemble"
  32. Yu-Gi-Oh! Duel 202202 (Duelist Duel 143): "The Eight Finalists"
  33. Yu-Gi-Oh! Duel 222222 (Duelist Duel 163): "The Rise of Ra!"
  34. "TRANSCEND GAME (part 1)"
  35. "TRANSCEND GAME (part 2)"
  36. a b c d Yu-Gi-Oh! The Dark Side of Dimensions