Father is the central antagonist of Fullmetal Alchemist: Brotherhood, known in Japanese as Hagane no Renkinjutsushi. He is the homunculus progenitor created from Van Hohenheim's blood and the Dwarf in the Flask, later taking the title "Father" or "Otou-sama". Calm, highly intelligent, and manipulative, he orchestrates large-scale events to achieve godlike power and transcend human limits. He serves as the hidden mastermind behind the homunculi and the main force driving the series' conflict.