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Mokuba Kaiba (かいば モクバ Kaiba Mokuba) is a recurring Yu-Gi-Oh! character. He is Seto Kaiba's younger brother and the only person who receives affection from him.
At the beginning of the manga, Mokuba was very mean and would go as far as trying to trick Yugi Muto 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!" He must really respect Yugi as he starts to think 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 naïve 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 Seto's enemies forcing Seto 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.