Olivier Mira Armstrong

General Major Olivia Armstrong is Alex Louis Armstrong's older sister. She is in charge of Briggs, the northern military border. She scoffs at the concept of "equivalent exchange" and believes "survival to the fittest" is the only law in life. Her subordinates are loyal, but if it ensured the survival of Briggs, they would leave her to die if the need arised, and she wouldn't hold it against them. She can't stand Colonel Roy Mustang, and she is brutal towards her little brother. She considers both of them to be weak and insults to the military.

One of her closest surbordinates is Major Miles, a soldier whose grandfather was Ishbalan; he is of many bloods due to several inter-racial unions, beginning with his grandparents. It is possible that he is also part Xingese, but his Ishbalan blood is the most prominint.

Olivia assists Edward and Alphose after the homunculus Sloth inflitrates Briggs on accident. She helps them out because of personal reasons and her determination to protect Briggs, even if it is from the military itself. She thinks of Edward and Alphonse as whiny children.

Only one person has ever outsmarted Olivia before. Only Ed and Al know the identity of the person is: their teacher, Izumi.

After having killed the corrupted general Raven who ordered her to set Sloth free, she answerd Führer King Bradley's summon and went to central where she was given Raven's seat at Central military headquarters. The other generals showed them their army of lesser Homunculi and told her their plans, but in fact she was held hostage to prevent her soldiers of Briggs from rebellion, which they did nevertheless.

When Roy Mustang started his attack, she mocked the corrupted generals, stating that as they always stayed "confortably" in Central, they never knew what was a real war and were unable to deal with it directly. She then killed one of the two generals and took the other hostage but Sloth, sent to deal with her killed him by surprise. Thanking the Homunculus for preventing her to "dirt her blade with that scumbag's filthy blood" she fearlessly engaged a fight against him, soon joined by her brother. The two sibling were seemningly defeated by the Homunculus.