Mysterious Heroine X is a fictional character from the mobile game Fate/Grand Order, a part of the larger Fate series by Type-Moon. She is portrayed as a Saber-class Servant, parodying the popular image of a 'mysterious warrior.' Her design is based on the character Artoria Pendragon, and she acts as a comedic take on the archetype of a wandering hero. Within the game's storyline, she is known for her peculiar mission to eliminate other Sabers, which adds a humorous twist to her character. Mysterious Heroine X is characterized by her lighthearted personality, love for fast food, and her iconic blue outfit.