 He is Seto Kaiba's younger brother and the only person Kaiba ever shows any love or affection to. Eternally devoted to his brother Seto and is constantly by his side. He is Naive and good-natured, and will do whatever his brother tells him to. Indeed, Mokuba is perhaps the source of his brother's more human and positive traits, and Mokuba has acknowledged that to everyone else Kaiba can seem like an unpleasant person to be around but Mokuba recognizes the good in his brother.