Ahab Mobiledick is the primary antagonist of the 1976 anime Machine Hayabusa, serving as the leader of the villainous Black Shadow racing team. He is known as the demon king who controls the racing world from the shadows, and his organization is responsible for the death of the protagonist's brother during a race. He is consistently depicted wearing a suit of armor, which conceals his true face and identity for the majority of the series.

In terms of his role in the story, Ahab Mobiledick commands the Black Shadow team, dispatching his subordinates to interfere with races and secure victories through sabotage and violence. He represents the central obstacle that the hero, Hayabusa Ken, must overcome to avenge his brother and bring justice to the racing world.

The most significant detail regarding his background and development is that his true identity is revealed only in the final episode. Underneath the armor, he is Benny Kramer, a former racing driver of exceptional talent. Kramer was permanently banned from the world racing circuit because he repeatedly participated in and caused deadly murder races. Following this revelation, his motivations are understood to stem from a past filled with disgrace and a subsequent desire to control the racing world from a hidden position of power.

Information is not available regarding his personality traits beyond his role as a villain, his specific motivations aside from his hidden past, his key relationships with other characters, or any notable abilities he may possess.