Despite being younger than his siblings, David is quite a bit smarter, but he is also rather paranoid, having many phobias, and sometimes being a bit shy. He is also a natural over-achiever, and can't stop working hard. He is determined to prove himself in the eyes of others, especially his siblings.
David (like his siblings) does not have a real-life basis. He was designed by the Fat Controller.
David is painted blue with orange lining and wheel spokes.