Wu Zetian, known as Caster of Nightless City in Fate/Grand Order, is a Servant character based on the historical figure Wu Zetian, the only female emperor in China's history. In the game, she is depicted as a Caster-class servant with a focus on charm and deception, reflecting her historical reputation for political cunning and intelligence. Her character's abilities often revolve around manipulation and strategic planning. In the Fate/Grand Order storyline, she plays a role that mixes historical elements with fantasy, adding depth to the game's diverse narrative universe.