Brynhildr is a Servant from Norse mythology who appears in the Fate series, most notably in Fate/Grand Order. She is a legendary Valkyrie and shieldmaiden known for her tragic love story with Sigurd. As a Servant, she typically manifests as a Berserker-class combatant, embodying her fierce warrior nature. Her personality is marked by intense passion and devotion, though she struggles with the berserker curse that amplifies her rage in battle. Despite her fearsome combat abilities, she maintains a romantic and idealistic side, particularly regarding her connection to Sigurd. Her skills reflect her mythological heritage, including mastery of combat and divine abilities associated with Valkyries.