Lucius Fox is a head of development at WayneTech, Bruce Wayne's corporation. He designed most of Batman's tech, including the Batmobile, Grappling gun and the Batsuit. In the DS version he is a playable character.
CEO of Wayne Enterprises, Fox has the "Midas Touch", an ability to turn failing businesses into successful conglomerates. Fox is called in to the failing Wayne Enterprises and brings a balance to both Waynes private and business finances, including heading the project that produced the prototype that would become the Batwing. In addition, he also manages the particulars of the Wayne Foundation as well while Wayne dictates the organization's general policies. Since then, Fox has been approached time and time again by other companies seeking his expertise. After overcoming the original challenge of returning Wayne Enterprises to its glory, Fox has elected to stay, having been given an unparalleled freedom in the company.