His real name is not known. Scar's brother fell in love with
a woman who died of illness before they could get married.
Going against his people's taboo, Scar's brother attempted
to revive his lover with alchemy. The
failed attempt created the homonculus Lust and Scar's
brother was exiled from Ishbal. It is also indicated that he
lost his male organs during the transmutation process.
Years later, Scar's brother returned when the military
attacked Ishbal, and tried to help the Ishbalans by creating
the Philosopher's Stone. However, he used the dying people
of Ishbal as the ingredients while using his own body to
house the Stone. Later, after Kimblee fatally wounded Scar,
Scar's brother transferred the "still-incomplete"
Philosopher's Stone into his right arm, then ripping it off
himself and grafting the limb onto his brother with the last
of strength. This saved Scar's life at the cost of his own.
-divinedragonking