Barry the Chopper (バリー・ザ・チョッパー, Barī za choppā) is a serial killer who earned infamy in Central for his butchering of many innocent women. In the anime his spree is brought to an end by the Elric brothers, though in the manga he is captured sometime before the start of the series. Though reported to have been executed, Barry's soul is actually removed from his body and bound to a suit of armor in one of the military's experiments. He is subsequently assigned to guarding Laboratory 5, where he encounters the Elric brothers once again. When Lab 5 is destroyed Barry flees, becoming a mercenary in the anime where he is ultimately killed by Scar. Barry plays a more pivotal role in the manga, being convinced to work with Roy Mustang rather than becoming a mercenary. He first helps in Maria Ross's escape from the military and later draws out the homunculi in an attempt to capture them. While helping with the latter, Barry comes across his old human body. The soul of an animal has been bound to it, causing it to rot and fall apart as the body rejects its new inhabitant. To fulfill his dreams of butchering himself he tries to kill his body, though his armor is destroyed by Lust before he can do so. While Barry's blood seal is able to survive this, his original body destroys what is left of him and dies.

Source: Wikipedia