Wow, he does look a lot like Kaiba. Even the jacket is very similar. Although...I never knew that when he wasn't playing a children's card game, that he was fighting off scary things and posing elegantly under streams of light. Kaiba is a double-agent it seems.

On the topic of real-life Kaiba, I really do think he exists somewhere. Why, you ask? Probably because I'm crazy, but that's beside the point. Someone with such an abrasive personality and complex character must have been based on someone that the author knew. Or, that's my hope anyways.