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.