Barghest is a major Servant character in Fate/Grand Order, specifically introduced in the 'Lostbelt No. 6: Fairy Round Table Domain, Avalon le Fae' storyline. As the Faerie Knight Gawain, she is modeled after the legendary figure Gawain, but reimagined as a faerie with a lupine motif. Barghest serves as both an antagonist and an ally, struggling with her bestial nature and desire for acceptance. Her tragic story and complex personality make her memorable within the game’s narrative.