Heymans Breda is one of Roy Mustang's most trusted subordinates. He was recruited by Mustang for his high level of intelligence, indicated by his talent with chess and other strategy games. Despite his intelligence, he still has an irrational fear of dogs. Breda is usually tasked by Mustang with jobs that require he travel abroad. In the course of doing so he uses up all of his days off, showing his dedication to Mustang. He is transferred to Western Headquarters when Mustang's group is broken up by the homunculi. In the manga, he eventually defects from the military so that he can help Mustang overthrow King Bradley.