Leif​ is a playable character from Fire Emblem: Genealogy of the Holy War, Fire Emblem: Thracia 776,​ and as DLC Fire Emblem: Awakening. He is the prince of Leonster, the son of Quan and Ethlyn, brother of Altena, the nephew of Sigurd, the cousin of Seliph, and the grandson of Vylon (Ethlyn's side of the family) and Calf (Quan's side of the family). He is the descendant of Noba on Quan's side and Baldur on Ethlyn's side.

After the fall of Leonster, he managed to flee, alongside Finn and Nanna. After hiding out at several cities such as that of Alster and Tahra, Leif finally settled down in a small village known as Fiana. He inherits the iconic Light Brand from his late mother, Ethlyn, which is, incidentally, his personal weapon in the events of Thracia 776.

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