Ares

Ares is a playable character from Fire Emblem: Genealogy of the Holy War. He is the son of Eldigan and Grahnye, and is the inheritor of the Demon Sword Mystletainn. In the events of the game, Ares is stationed at Darna alongside Lene, working under Javarro's band of mercenaries.

When Seliph's liberation army passes through the border, Ares leaves to fight with Javarro. Javarro confesses that Bramsel, the lord of Darna, has imprisoned either Lene, or Laylea, and urges him to forget about her. Ares, enraged, turns against Javarro, despite the latter having raised him after Grahnye's death. In order to save the imprisoned girl, Ares decided to join Seliph's army, albeit reluctantly, as he believes that his father was betrayed by Sigurd. He will later learn of the truth behind his father's death upon meeting Nanna, who explains that Sigurd had not betrayed Eldigan and that the two had always been friends despite how things had eventually turned out.

(Source: Fire Emblem Wiki)