Byleth is the main protagonist of the video game series Fire Emblem, specifically in Fire Emblem: Three Houses. They are a skilled mercenary and the child of the legendary hero Sothis. Byleth possesses unique abilities, including the power to wield the Sword of the Creator and the ability to teach and lead students at the Garreg Mach Monastery. In the game, players can choose Byleth's gender, which affects character interactions and story elements. Byleth's journey involves forming alliances with various factions, such as the Black Eagles, Blue Lions, and Golden Deer, while navigating complex political and personal relationships.