Leaf (リーフ Riifu), full name Leaf Faris Claus (リーフ・ ファリス・クラウス Rīfu Farisu Kurausu), is the prince of Lenster, the son of Cuan and Ethlin, brother of Altenna, the nephew of Siglud, the cousin of Celice, and the grandson of Vylon (Ethlin's side of the family) and Calf (Cuan's side of the family).
After the fall of Lenster, he escaped along with Fin and Nanna. After hiding at several cities in Thracia, such as Alster and Tahra, Leaf finally settled down at a small village called Fiana. He eventually inherits the Light Sword from his late mother, Ethlin. He is defending his home of Lenster under Bloom's attack when Celice comes to help him.
He is the hero of Fire Emblem: Thracia 776, and is 15 years old there. In Fire Emblem: Seisen no Keifu, he is 16.