Mokuba Kaiba was Seto Kaiba’s little brother on the Yu-Gi-Oh anime series. He was all right character but he didn’t do a whole lot.

He was mainly wanted by Pegasus’ men and Kaiba’s current business partners so they could control them and take all of the family’s money and technology because somehow that’s legal.

For which Pegasus ends up stealing his soul for a while. Which doesn’t make a lot of sense because he didn’t technically lose the card game, so why could Pegasus take his soul like that and not anybody else’s.

Luckily for him and his brother, Yugi manages to defeat Pegasus and make the Duel Monsters creator free them from their prisons.

And he spends the majority of the later seasons tagging along with his beloved older brother.