Frank Archer is a character exclusive to the first anime.

He is cool, calm, and collected, with a love for violence and war. He dreams of becoming a hero on the battlefield, viewing it as a way to rise up the ranks of the military. To this end, he does whatever is necessary to please his superiors, and always ensures that his actions earn him some publicity. As the series progresses, Archer develops an interest in the military's various projects, such as the homunculi, chimeras, and the Philosopher's Stone.

Archer lost the left half of his body when the Philosopher's Stone was created in Liore, and received automail modification in order to regain his mobility. After the operations left him mentally unstable, Archer raged through Central, carrying out King Bradley's ordered executions. Riza Hawkeye shoots Archer down while he tries to kill Roy Mustang.
(Source: Wikipedia)