Gearhead

Origin:
Gearhead is Nathan Finch. While he was kidnapping and holding his boss' daughter for ransom, he runs afoul of Batman who rescues her. Unfortunately he wasn't able to save Nathan from falling to an icy death. Nathan Finch's body was discovered by two down-and-out people who take him to an unnamed underworld doctor. It turned out that Nathan wasn't dead and the doctor wanted his knowledge of cybernetics. Due to ravages of frostbite, the doctor removed his arms and legs and replaced them with cybernetic arms and legs. Nathan becomes Gearhead and develops his own cybernetic arsenal of removable body parts as well as a goal to exterminate Batman, whom he refers to as the "vermin".

No Man's Land:
He played a part in the Robin section of the No Man's Land crossover, in which he is one of a number villains competing for control of Gotham City's sewers. Without the use of Cybernetic arms and legs, he is forced into partnership with the thuggish Tommy Mangles, carries around Finch's torso. The duo are iced by Mr. Freeze, a fate particularly frightening for Gearhead, given his origin.

Rush City:
Gearhead puts in an appearance in the comic mini-series Rush City, where he is physically attached to his car.

Infinite Crisis:
In Infinite Crisis, Gearhead became a member of the Secret Society of Super Villains.

Powers and Abilities
Gearhead possesses an arsenal a cybernetic weapons in his arms and legs, as well as spare limbs that he can swap out on the fly.

In other media
Gearhead first appeared in the The Batman episode "RPM" voiced by Will Friedle. In this version, Gearhead (Nathan Finch) is a criminal car racer, who operates with advanced forms of nanotechnology. He appears to be a cyborg, as the Batman says "he is nanotechnology". His right arm has cords of some kind of nanotechnological virus which infects the vehicle and alters it into a yellow-colored, more hi-tech form with advanced features. His fingertips can extend to form claws when he is engaged in combat. His right arm bears certain shells of the nanotechnological virus, which can fire at other vehicles and control them remotely. Also, he has a robotic right eye that can automatically guide and maneuver his vehicle through traffic and other obstructions for him. Gearhead first shows up in a yellow race car during a charity race that Bruce Wayne (the Batman) is also competing in. Gearhead wins the race and steals all the charity money and rides off, leaving all the contestants baffled. Soon after, he ends up getting chased by the Batman in his Batmobile. However, Gearhead appears to be too fast for the Batman, and later the Batman eventually loses control of the Batmanbile and falls off a cliff. He manages to jump but has the Batmobile destroyed. Later, at the Batcave, Wayne builds a new Batmobile with upgraded parts from other prototypes in his possession, from the Wayne Industries and even from the nanotechnological shell that he recovered from a vehicle that Gearhead was earlier controlling. With a bigger and better vehicle, the Batman along with Batgirl, out races Gearhead and defeats him. When he tries to steal the new Batmobile by injecting his cord into it, he is electrocuted, as the Batman tells that he reversed the effects of the virus so that it can't infect his vehicle. Gearhead is then sent to jail.