Hideo Kojima is not only the president of Metal Gear Solid Peace Walker, but he's also a client.
Err... that is to say, he's in Peace Walker.
Do a certain something (specifics can be found at this strategy page), and you'll be able to add "Game Designer" Hideo to your Mother Base staff.
Hideo's profile says "My body is made up 70% of movies. You can decide what to do with the remaining 30%."