Mokuba stars in quite a few of the Yuugiou videogames.
For those of you who don't know what a sprite is, it's those adorable little images that you use in the game. An example?
Those lil pics of Mokuba in each corner!
Yuugiou sprite finding is exremely difficult overall, and to find a minor character like Mokuba makes it even worse.
So, what I'm offering is this: Email me with the game, and which sprites you'd like, and I'll get them for ya. Please note that PS1 & PS2 games won't be 100% clear. I have all of the games he stars in, including the rare game Capsule Monster: Breed & Battle (PS1, starring the original cast of Yuugiou).
Email me and let me know!