He is known only as Scar because of the unique scar on his face. He often places himself in a position to act as a judge and messenger of his God, Ishbala, by killing Nationally Certified Alchemists. The tattoo on his right arm conceals the power of destruction bestowed upon him by his brother.
The fates of Scar and the Elric brothers appears to be intertwined as they cross paths often. Their relationship seems to change upon each meeting depending on the circumstances.