Mokuba Kaiba Mokuba Kaiba ( モクバ Kaiba Mokuba ) is a recurring " Yu - Gi - Oh ! " character . He is Seto Kaiba ' s younger brother and the only person Seto ever shows any love or affection to . Appearance . Mokuba has tan skin with grayish - purple eyes and black hair . In the flashback , Mokuba was seen wearing a greenish - blue , longsleeve sweatshirt , black shorts , white socks , and black dress shoes . In the present , he wore white orange - striped open - collared shirt with a red sweatshirt over it , a light blue bandanna around his neck , light blueish - green jeans , and black sneakers . Occasionally , Mokuba puts up his bandanna like a mask and wears a purple hat to hide his identity . During the events of Battle City , Mokuba wears a green blue - striped shirt with a yellow vest over it , dark blue jeans , and blue sneakers . Personality . At the beginning of the manga , Mokuba was very mean and would go as far as trying to trick Yugi Mutou to get back at him for defeating his older brother , Seto Kaiba . Mokuba is a gamer who specializes in " Capsule Monster Chess " ( " Capmon " ) , but is not as good of a gamer as his brother . He is so committed to avenging his brother ' s humiliation , he uses several extreme measures , such as having his friends brandish a machine gun , a knife , and a stun gun in one manga chapter to coerce Yugi to play Capsule Monster Chess with him . In the " Yu - Gi - Oh ! Duel Monsters " anime , Mokuba is eternally devoted to his brother Seto Kaiba and is constantly by his side . He is more naive and good - natured , and will do whatever his brother tells him to . He also seems to trust Yugi and his friends more than he did previously . There is a part in one episode when he saw ( Yami ) Yugi watching him from another building when he was about to kick some brothers out of the Battle City grounds , when he considered , " You know , I bet Yugi would give them another chance ! " Which shows that he must really respect Yugi as he starts to want to think and be like him . In the original Japanese version of the " Yu - Gi - Oh ! " manga , Mokuba tends to omit honorifics when referring to people other than his older brother . He also has a habit of calling Jonouchi " Jōnouchi no yarō " ; ( that bastard Jonouchi ) . Mokuba politely refers to his older brother as " nii - sama " ( honorable older brother ) . He is very forgiving , especially to his brother . Even after Noah hypnotized him , and brainwashed him into forgetting who Seto and the others were , Mokuba forgave him and treated him like a brother ( they are actually step brothers ) . In the " Yu - Gi - Oh ! Duel Monsters " anime , Mokuba is a kind - hearted boy who is naive to the ways of the world . He succeeds in befriending Yugi and his friends ; his brother does not approve of this . Mokuba does not Duel in the first series anime . He only Duels in the second series and manga . Mokuba has an unlucky streak of being kidnapped by Kaiba ' s enemies forcing Kiaba to show his kinder side and rescue him , and is , in fact , the only person his brother is shown to consistently care about more than anyone or anything . Biography . History . At a young age , Mokuba and Seto were orphaned . Their actual surnames are unknown . Their mother died when Mokuba was born , and their father supposedly died in an accident when Seto was eight . Their relatives used up their inheritance and left them at the city orphanage . Seto was bright and intelligent , which led to many prospective parents wanting to adopt him , but Seto swore to protect his brother at all costs , and wanted Mokuba adopted with him , which all had refused . Whenever bullies would pick on Mokuba , Seto would always stick up for him , including jumping a child to get back a toy plane that he had taken from Mokuba . Although Mokuba was insistently happy at the orphanage , Seto had always aspired greater things for both of them and looked to the future . When the former head of Kaiba Corporation , Gozaburo Kaiba , arrived at the orphanage to perform a publicity stunt , Seto saw the chance to for him and Mokuba to leave the orphanage together , so he challenged Gozaburo to a game of chess and won , with that Gozaburo forced to adopt Seto and Mokuba . Mokuba was five at the time . Seto won by studying Gozaburo ' s chess methods . Six years later , Seto took over the company . In the second series anime , it showed that he had used Mokuba to do so . Seto planned gaining 51 % of the company in order to overthrow Gozaburo . Seto deliberately leaked this information to Gozaburo and accused Mokuba of telling Gozaburo . Mokuba sided with Gozaburo , who allowed Seto to gain 49 % of the company , believing that Mokuba would give him his 2 % . Gozaburo was fond of making his enemies think they were winning against him so they would look worse when he beat them , which Seto based his plan around . As Seto planned , Mokuba switched sides last minute giving his 2 % to Seto . Mokuba stated that he would never go against his elder brother . " Yu - Gi - Oh ! " . Duelist Kingdom . Mokuba was originally imprisoned by Pegasus on a high tower in Duelist Kingdom , in order to force Seto Kaiba to come and Duel Pegasus to rescue Mokuba ( in the Japanese version , he wanted the card that holds secret information about KaibaCorp that Kaiba entrusted to him ) . However , Mokuba escapes from the tower by a rope of knotted bedsheets , which only go a small way down the tower . After a rather nasty fall , Mokuba steals a boy ' s Deck and his star chips , leaving him to be kicked off the island . Yugi and his friends find the boy and promise to help him . They go back to the scene of the crime . Mokuba jumps out of the bushes and challenges Yugi to a Duel . The only cards he played were " Man - Eating Plant " and " Krokodilus " . Mokuba ' s identity then gets found out , and he explains that after Yugi beat Seto in a Duel , his brother had gone away and abandoned him , and that it was all Yugi ' s fault . Mokuba reappears tries to steal his star chips . Yugi gets Mokuba to see the error of his ways , and they all run to try and not let the boy get kicked off the island . All they succeed in doing is getting Mokuba captured again . Yugi agrees to Duel for his freedom , and wins . But Pegasus ' s thug , Kemo , takes Mokuba anyway , and lock him in a dungeon . Seto reaches him , and just as he is about to free Mokuba , Pegasus shows up and steals Mokuba ' s soul , forcing Seto to Duel Yugi in a largely unfair match with Mokuba ' s soul on the line . In desperation , Seto backs away to stand at the castle ' s edge , telling Yugi he will die with his dragons , implying that if he couldn ' t save Mokuba , his life wasn ' t worth living . ( In the dub , Seto backed on to the ledge , knowing Yugi wouldn ' t attack him and let him get hurt , therefore letting Kaiba win the match ) . Not wanting to see Seto die , Yugi allows him to win the Duel , only to see Seto lose his soul to Pegasus after Téa won Yugi the right to enter into the main castle . In the end , Mokuba gets his brother back , and Seto wins his soul back as well . Legendary Heroes . Seto and Mokuba come back from Duelist Kingdom and go back to KaibaCorp . Seto goes straight to the Big Five to get revenge on them for what they did to him and Mokuba . They manage to convince him that they did what they did to help Kaiba , not hurt him . To prove this , they tell him that they have finished the virtual world simulator that they had been working on . Kaiba , who became very eager to test it out , decided to wait to fire them after he tested the simulator . Mokuba was very against it , but Kaiba decided to do it anyway . While inside , it became very apparent to Kaiba that the Big Five had rewired the simulator and he became caught by a ninja . Mokuba , realizing it was a trap , swiped Kaiba ' s Deck from the chair and ran to get help . He recruited Yugi and his friends to help him . They went to Kaiba ' s personal lab for more chair simulators to get into the virtual world . Mokuba , Yugi , and Joey entered the world while Tea and Tristan stayed behind to stand guard . When inside , they first enter a graveyard where they run into 3 monsters . Mokuba shows Yugi and Joey how to summon a monster . They then run into a fairy Named Earu , that leads that to an old town . In there , Yugi suggests they split up to look around the town for clues about Kaiba . An old lady told Mokuba that she saw someone with a prisoner going towards a mountain and the only way to get there was to cross a large desert . They tried crossing the desert that ’ s after the town but get hit by a twister . They all end up back at the town with Mokuba shaken from the twister . An old man tells them that to cross the desert they need a special monster , a Niwatori card . In order to get it they must enter a tournament and win against the champion , Madame Butterfly . Joey goes up against the champ using the name Senor Porky . The champion turns out to be Mai , then she realized it ’ s Joey . She decided to help them out by getting the card by force and the running for it . While crossing the desert , they ran into a monster but Joey got rid of it . When they finally reached the temple after the desert Mokuba runs towards it , desperate to see his brother again . when everyone catches up to him they open a door inside the temple and see a maze . they soon hear a girl scream , making Joey run to help her . However , they are all ambushed by labyrinth tanks and only manage to escape thanks to Yugi using Magical Hats . they then see Iru again and it led them to a princess named Adina , who looks exactly like Mokuba ( except a girl ) . They then find the exit but it is blocked by a Gate Gaurdian . Yugi and Joey defeat it using Polymerization on Red - Eyes Black Dragon and the Summoned Skull and then adding Dragon Nails . Adina , thankful that they had saved her , took took them to her castle where they discussed the Heroes of Legend . Soon , however , the castle is surrounded by monsters . One of them captures Mokuba , who was dressed up like Princess Adina and then taken to the castlein the sky , to where Kaiba is . Upon meeting his brother , Mokuba set him free and gave back his Deck . Kaiba disapproved of Mokuba asking Yugi for help and wasn ’ t thankful to Yugi , Joey , or Mai . Unfortunately , the Big Five decide to make the Mythic Dragon appear even though there were no sacrifices . The dragons first target is the person who doesn ’ t have any monsters to defend himself with : Mokuba . Joey , however , ordered his Red - Eyes Black Dragon to take the hit therefore losing the game and disappearing . Then Mai gets hit and is taken . Yugi tries to convince Kaiba work with him by summoning his Blue - Eyes Ultimate Dragon but Kaiba refuses . The Mythic Dragon goes to attack Kaiba , but Mokuba , the only one realizing that the attack was for Seto , pushed Seto out of the way but got hit , leaving his brother devastated . In the end , Kaiba and Yugi worked together and defeated the mythic dragon . Afterwards , Adina turns out to be the Mystical Elf , and brought back Joey , Mai , and Mokuba . Reunited at last , everyone left the virtual world . Battle City . During the Battle City tournament , Mokuba is the Battle City commissioner , calling violations and penalties when needed . While his brother Duels , Mokuba wanders around town . The first violation he sees is performed by the Roba brothers . While the eldest , Espa dueled , his brothers used binoculars to see his opponent ' s hand . Mokuba tackles Espa ' s brother , and is about to throw Espa out when the younger Robas tell Mokuba about how their big brother protects them from bullies by winning Duels . This reminds Mokuba of his relationship with Seto , and he does not disqualify the Robas , commenting that big brother stories get him every time . As Mokuba walks away , he is ambushed by Rare Hunters and kidnapped . He is tied up and dangled from a helicopter , which flies over his brother ' s head . The Rare Hunters make Seto Duel with Yugi against infamous tag team Duelists Lumis and Umbra . The loser of the Duel would plummet to their death ( In the dub they would be sent to the Shadow Realm ) . While they Duel , Mokuba is taken to a warehouse , and locked up there with Téa . Together , they construct a tower of boxes , and Mokuba manages to escape , but Téa was captured before she managed to escape . Mokuba was ordered to go find Yugi and Seto . Kaiba ' s younger brother took a helicopter to pick his brother up . Virtual World . During the Virtual World arc , Mokuba and Seto are taunted by Noah as he showed them images from their past . Later on , Nezbitt , disguised as Tristan , kidnaps Mokuba where he is held captive by Noah while Kaiba faces Leichter . After Kaiba wins the Duel against Leichter , Noah brainwashed Mokuba , who forgot who Seto and his friends are , in an attempt to split them up . In the Duel between Kaiba and Noah , Seto was about to win the Duel when Noah used Mokuba as a shield by putting him between Noah and Noah ' s monster , so that Mokuba would be harmed by the attack should Seto choose to do so . Kaiba was unable to bring himself to harm his last living family member , allowing Noah to get the lead in the Duel . Eventually Kaiba manged to break through to Mokuba using his " Blue - Eyes White Dragon " card , and when Mokuba ran away from Noah Kaiba activates Last Turn . Kaiba picked Blue - Eyes White Dragon , and Noah chose his Deck Master which held the second Deck Master : Shinato , causing Seto to lose the Duel . Mokuba ran to his brother after he lost but unfortunately , Noah turned them both to stone before they could be reunited . After Noah ' s defeat against Yami Yugi , Noah tried to " help " the gang to escape from the Virtual World after Gozaburo reveals his plans . However , Noah tricked all of them so that he could escape using Mokuba ' s body . However , after a change of heart , Noah came back to the Virtual World to stop his father from taking Seto ' s body . Then Mokuba , Seto and Yugi left the Virtual World before it exploded . Battle City finals . Again , Mokuba continues to be a supporting character . He sadly watched Seto Duel and lose to the Pharaoh . He ' s also present when Kaiba and Joey have their Duel and witnessed Joey putting up a good fight , but ultimately Seto wins . He also questioned his brother ' s emotions as well and convinced him to be there when Yami Yugi faced Yami Marik in the finals . Waking the Dragons . Mokuba is a supporting character through this arc . He was with Kaiba during his Duels with Alister and is present during Kaiba and Yami ' s Duel with Dartz . Mokuba spoke with Seto after the first Duel with Alister concerning the Duelist ' s hatred towards Gozaburo and Kaiba . After Seto Kaiba and Yami Yugi ' s Duel with Dartz , Mokuba tried to go after his older brother , but Te ' a tell ' s him to stay . Grand Championship . Mokuba is again a supporting character , having the duties of inviting and helping Yugi and his friends through the whole championship . He was also the one who allowed Yugi ' s grandpa , Grampa Moto , to secretly enter the Grand Championship to test Joey to see how far he had gotten . Dawn of the Duel . Yami Bakura sent Mokuba ' s soul to the Shadow Realm to get Kiaba to come to Egypt and he wasn ' t seen again until the beginning of Yugi and Atem ' s final Duel where he and Roland tracked Kaiba to Egypt . Mokuba watched Yugi defeat the Pharaoh and escaped from the falling building where the two Yugi ' s dueled . Pyramid of Light . Mokuba was supporting his elder brother , helping with the preparations for his Duel against Yugi . He was also tasked with bringing Yugi to the arena in the first place . It should be noted that he was one of the few people who noticed the change in Kaiba ' s behavior and was genuinely worried about him . " Yu - Gi - Oh ! GX " . Mokuba was shown during Jaden ' s flashback of one KaibaCorp card illustration project . Deck . Anime . Mokuba was not seen using his own Deck in the anime and manga series . The only known cards in the stolen Deck were " Krokodilus " and " Man - Eating Plant " . During the Legendary Heroes arc , he used his brother ' s Deck until Seto was freed . Video games . In the video games , he would play with an animal themed Deck . Some of his Magic and Trap Card s involve kid - themed items , reflecting his naive nature . Worldwide Edition : Stairway to the Destined Duel . In , he used to play a Deck with only monsters and " Polymerization " , and always plays his monsters in Attack Position . He also has " Blue - Eyes Ultimate Dragon " as well . Gaming items . Capsule Monster Chess pieces . The first time Mokuba faced Yugi , he used the following Capsule Monster Chess pieces : When he faced Yugi in Death - T , he used the following :