Olivier Armstrong was born into the Armstrong family, a prominent family in Amestris known for their military lineage. From a young age, she showed exceptional aptitude for leadership and combat, making her way up the military ranks. Understanding the harsh realities of life within the military and the political complexities of Amestris, she quickly became one of the most formidable officers in the country. She often uses her cold demeanor and strict discipline to maintain control of her subordinates in an environment rife with corruption and deceit. Her most notable role in the series is leading the northern forces during the conflict with the homunculi, where she showcases both her tactical genius and fierce loyalty to her troops. Over time, Olivier's character development reveals her understanding of leadership is rooted not only in strength but also in protecting those under her command. This evolution reflects the broader themes of sacrifice, loyalty, and responsibility that permeate Fullmetal Alchemist: Brotherhood.